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Help with carb choice, please...LA 360 rebuild #1585024
02/27/14 05:23 PM
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Tulsa, Oklahoma
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So, it's looking like i am finally going to get to build my 360 in the near future. I would appreciate some help on carb choice. I have looked at several articles, but am still undecided.

The engine is an LA 360 (74 model) that will be in front of an a-500 trans. it'll be .030 over with KB107 pistons. comp XE262 cam, rebuilt EOM heads with 3 angle valve job, and for now, stock iron 4 bbl intake. From what I have read, I am leaning towards something along the lines of a holley 750 with vacuum secondaries, but want to ask you guys... looking for good performance and torque with good drivability and some symblance of economy. is there such a creature in existance? LOL... what do you guys suggest for my application?


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Charger_440] #1585025
02/27/14 05:56 PM
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Kent, Wa
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Holley 4175... or a Q jet..

the 750 is a tad to big IMO and you will need an adapter if your intake is a spreadbore.


I am truckless..
Re: Help wtih carb choice, please...LA 360 rebuild [Re: 340SHORTY] #1585026
02/27/14 06:10 PM
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I'll have to look again to verify... I'm sad to say it's been years since i looked at my parts. (it became discouraging, LOL) I think the intake that I have is a square bore. (IE two large oval inlets vs 4 smaller barrel sized inlets


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: 340SHORTY] #1585027
02/27/14 08:40 PM
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what Shorty said, a properly setup Q jet or thermoquad. A 750 Holley is too big for your app/no economy. the iron spreadbore 360 OE intake is an excellent piece (tho heavy)


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Re: Help wtih carb choice, please...LA 360 rebuild [Re: RapidRobert] #1585028
02/27/14 08:50 PM
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Puyallup, WA
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spread-bore: Thermoquad
square-bore: Holley 670 Avenger series.



LemonWedge - Street heavy / Strip ready - 11.07 @ 120
Re: Help wtih carb choice, please...LA 360 rebuild [Re: StealthWedge67] #1585029
02/27/14 09:06 PM
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petaluma,ca. u.s.a.
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Re: Help wtih carb choice, please...LA 360 rebuild [Re: west] #1585030
02/27/14 09:15 PM
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Quote:

http://www.summitracing.com/parts/hly-0-4778c/overview/




Overkill

Why do people insist on putting oversized carbs on engines?

A 600 cfm would be best, heck a 500 would be better than a 750 for what he's building.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Supercuda] #1585031
02/27/14 09:29 PM
02/27/14 09:29 PM
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Northern Indiana
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625 Street Demon. Calibration is nearly perfect out of the box for that engine, which is not the case with a 3310 750 .

Keith

Re: Help wtih carb choice, please...LA 360 rebuild [Re: Dunnuck Racing] #1585032
02/27/14 10:05 PM
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The Street Demon is a very good choice. Go with the plastic center.


Master, again and still
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Supercuda] #1585033
02/27/14 10:59 PM
02/27/14 10:59 PM
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Cincinnati, Ohio
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Quote:

Quote:

http://www.summitracing.com/parts/hly-0-4778c/overview/




Overkill

Why do people insist on putting oversized carbs on engines?

A 600 cfm would be best, heck a 500 would be better than a 750 for what he's building.





I know I did it when I bought my first carb for my 340. I bought a 750 DP thinking I'll grow into it. And if I'm going to spent big bucks I don't want something too small or won't let my motor make max HP.

Drove the car for too many years with it, never ran that great until I got it up in RPMs.

Then got a 600 and it out runs that 750 on the street and runs so much better on the street.
Got holly 650 sitting on the bench I'm gonna try this summer to see if I can dial it in.

I've been running the 600 now for a long time, got it figured out for all altitudes and temps.

I'd say go for a 600-650 max CFM.

Re: Help wtih carb choice, please...LA 360 rebuild [Re: Supercuda] #1585034
02/28/14 12:02 AM
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petaluma,ca. u.s.a.
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Quote:

Quote:

http://www.summitracing.com/parts/hly-0-4778c/overview/




Overkill

Why do people insist on putting oversized carbs on engines?

A 600 cfm would be best, heck a 500 would be better than a 750 for what he's building.



The carb listed is a 700 not a 750 and I run it in my setup that is very similar to his build.
The car runs low 12's and has very decent street manners.

Re: Help wtih carb choice, please...LA 360 rebuild [Re: west] #1585035
02/28/14 02:34 PM
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OP, listen to Dunnuck. He has had the carbs on a dyno with A/F measuring, so I'd say his is the only opinion not based on guesswork.

R.

Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585036
02/28/14 02:39 PM
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6 Pack is the only way to go!


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Re: Help wtih carb choice, please...LA 360 rebuild [Re: Supercuda] #1585037
02/28/14 03:48 PM
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Oakdale CT
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Quote:



A 600 cfm would be best, heck a 500 would be better than a 750 for what he's building.




Actually I have a fairly mild 5.9 in my Duster with exhaust manifolds and with a 625 cfm Edelbrock it would pull a vacuum at WOT. I swapped it out with a 750 Carter AFB and it screams.

A 750 Street Demon would be an excellent choice.




"I think its got a hemi"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: gdonovan] #1585038
02/28/14 07:32 PM
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Charger_440 Offline OP
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ok, so, this post is going to make me sound like a complete rookie here, but i've never dealt with an OEM iron 4 bbl from this era. the intake (i'm going to guess is a spread bore) it has 2 inlets, but they're not open ovals like you see on a modern square bore. they're figure 8 shaped. making me think it's a spread bore intended for a TQ... am i right?

i may be looking at a different 4 bbl intake, may even go Ederbrock or something...still gathering you guys' information.

arent the TQs 800 CFM?

i'm gladly taking all of you guys' information to construct the big picture adn make my decision


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Charger_440] #1585039
02/28/14 07:41 PM
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Quote:

making me think it's a spread bore intended for a TQ... am i right?




Yes, and its very heavy. The TQ intake is the best flowing of the factory units but an Edelbrock RPM will blow it away and can be had used for as little as $100-$150

Quote:



arent the TQs 800 CFM?




800 and 850 from the factory.




"I think its got a hemi"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: gdonovan] #1585040
02/28/14 07:56 PM
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ok, so, definitely dont need thatmuch carb is the general concensus is that i need les than 750. a couppl of the articles i have read show on similar builds, improvements in stats up through 750CFM dropping off at 800 and up. so, maybe i'll start searching in the direction of an eddy intake and sompatible square bore carb.

is that Demon a square bore? how pricey?
keep the info and suggestions coming guys.

any market for this TQ intake?


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Charger_440] #1585041
02/28/14 08:11 PM
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Quote:



is that Demon a square bore? how pricey?






Its a TQ clone by Holley but will bolt on a squarebore intake. Summit or Jegs has them for reasonable money.

Quote:



any market for this TQ intake?




I have one under my bench for 20 years, can't give it away.




"I think its got a hemi"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Charger_440] #1585042
02/28/14 08:16 PM
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Just got done ordering a new street demon #1901 625cfm. Amazon had it for $349. + tax, so I called around and found someone to match price with no tax or shipping. Going on my 360 in a van so I got the poly model which is little more $$ than the all alum model #1900 but will work better in the heat I think.

Re: Help wtih carb choice, please...LA 360 rebuild [Re: Beebuzzn] #1585043
02/28/14 10:45 PM
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so...dont look at me sideways when I ask this, lol. I have avoided aluminum imtales because my only experience with them is that they heat soak and cause vapor lock when hot.

is there
A. an iron square bore intake with performance akin to the edelbrock?

B. an aluminum intake that wont have issues or a way to avoid the heat issues?


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Charger_440] #1585044
02/28/14 11:20 PM
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Quote:

so...dont look at me sideways when I ask this, lol. I have avoided aluminum imtales because my only experience with them is that they heat soak and cause vapor lock when hot.

is there
A. an iron square bore intake with performance akin to the edelbrock?

B. an aluminum intake that wont have issues or a way to avoid the heat issues?




Exhaust cross over in the intake is your issue. The Edelbrock RPM AirGap doesn't have one so that wouldn't be an issue. Or you can block it off, I used JB Weld to plug the ports in the intake and it worked for years out here in Texas.

I ran an Edelbrock Performer carb on my stock TQ intake for years, it bolts on with a thick spreadbore base gasket and longer studs. No need for an adapter and since you already have one, I'd run it.

You build is very close to what I did to the 360 I put into my 87 Diplomat. Except I ran J heads for a while then 302 castings for testing. Same cam. With the 600 Performer I got better mileage and less top speed, with the 750 Performer I got better top speed but less mpg. the 600 had better response.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Supercuda] #1585045
02/28/14 11:31 PM
02/28/14 11:31 PM

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QuickFuel 600 vacuum with electric choke $319 and one of the best OOB carbs on the market
They are the best for the least out there--I install several a week and the 750 is the same $$
Killer street carbs repeat Killer for the money
I would not install an Edelbrock if it was free
Holleys way too much $$

Re: Help wtih carb choice, please...LA 360 rebuild [Re: Charger_440] #1585046
03/01/14 01:59 PM
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Guys guys guys...dyno testing tells all.

Go back to Steve Dulcich's Junkyard Jewel 400hp 318 article, the one where he ported the 302 heads to within an inch of their lives and did some dyno runs.
That ultra heavy mid-70s 360 EGR manifold was only something like 25hp down on the Perf RPM at the top end of the horsepower charts. That intake is really good, just don't drop it on your foot!

Take a long look at it. It is a true highrise design, the ports are 360-sized and have decent curves. It was probably developed with a real eye towards fuel distribution.

It is a spreadbore intake, made to use a Thermoquad. The Street Demon will bolt right on, the SD is made to fit on either squarebore or spreadbore intakes.

About CFM: The Street Demon, the Thermoquad, the AVS/Thunder Series carbs, and Quadrajets all have adjustable air doors which will only let the carburetor be as big as the engine "wants" it to be. You could put a Thermoquad or any of those other carbs on a Slant Six and have them work properly. My Mercedes 173 cubic inch six came stock with a German copy of a Quadrajet that probably flows 700cfm wide open.
Holley vacuum secondary carbs also tailor the carb size to engine demands.

R.

Re: Help wtih carb choice, please...LA 360 rebuild [Re: dogdays] #1585047
03/01/14 07:56 PM
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Quote:



About CFM: The Street Demon, the Thermoquad, the AVS/Thunder Series carbs, and Quadrajets all have adjustable air doors which will only let the carburetor be as big as the engine "wants" it to be.




Not true on the AVS, the air door just replaces the counter weight system.




"I think its got a hemi"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585048
03/01/14 10:03 PM
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I was down at the Indy Cylinder Head trade show and swap meet today where I ran into Randy Bolig. He told me the article I wrote for him (Mopar Muscle) where I tested several carburetors on a mild 360 will be in print in the next couple of months.
If you can wait that long please do yourself a favor and read it before you make a decision. Some people's old favorite type carburetors dont hold up so well.
And no matter how the secondary side is adjusted doesn't matter when the metering is all wrong for today's fuels,.....
Keith

Re: Help wtih carb choice, please...LA 360 rebuild [Re: gdonovan] #1585049
03/01/14 11:46 PM
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Quote:

Quote:



About CFM: The Street Demon, the Thermoquad, the AVS/Thunder Series carbs, and Quadrajets all have adjustable air doors which will only let the carburetor be as big as the engine "wants" it to be.




Not true on the AVS, the air door just replaces the counter weight system.




Not exactly. The counter AFB's weighted air door is in the carb, under the top plate.
The AVS's adjustable air door is above the top plate and is adjusted in the same manor as the TQ. It will use two screw drivers to do. The AFB air door is adjustable via adding or deleTing the amount of weight of the counter weight. Not really adjustable IMO.

To the thread starter;

The TQ comes in two sizes commonly rated as a 800 & a 850. The small primary side of the carbs offer excellent drivability and throttle response. They have multiple ring boosters. Excellent amotimzation of the fuel.

The secondary sides are equal in size on both carbs @ 2-1/4 inch each side. The adjustable air door allows the door to open later on a more mello engine or sooner for a heavy breather. Engine size barley matters with this carb.

The only thing I can suggest is use the small primary (1.38) on 318/273 engines or a near stock 340/360. Use the larger primary (1.50) on 340 and up engines. Even better if the engine has some guts. (AKA Balls)

Tuning parts are really hard to find. I wouldn't use the carb if you do not all ready have spare parts to tune with.

Re: Help wtih carb choice, please...LA 360 rebuild [Re: Rob C] #1585050
03/02/14 12:24 AM
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Quote:


The AVS's adjustable air door is above the top plate and is adjusted in the same manor as the TQ. It will use two screw drivers to do.




The TQ has an adjustable stop controlling how FAR the door opens, the AVS does not.

Both are adjustable for spring tension, this controls when fuel starts being pulled from the boosters and is in effect a "pump shot" for the secondaries.

I can take pictures if you like.




"I think its got a hemi"
Re: Help wtih carb choice, please...LA 360 rebuild [Re: Rob C] #1585051
03/02/14 12:38 AM
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Quote:

The TQ comes in two sizes commonly rated as a 800 & a 850. The small primary side of the carbs offer excellent drivability and throttle response. They have multiple ring boosters. Excellent amotimzation of the fuel.

The secondary sides are equal in size on both carbs @ 2-1/4 inch each side. The adjustable air door allows the door to open later on a more mello engine or sooner for a heavy breather. Engine size barley matters with this carb.

The only thing I can suggest is use the small primary (1.38) on 318/273 engines or a near stock 340/360. Use the larger primary (1.50) on 340 and up engines. Even better if the engine has some guts. (AKA Balls)

Tuning parts are really hard to find. I wouldn't use the carb if you do not all ready have spare parts to tune with.


I'd suggest getting an early TQ (not sure the cutoff year but none with the EGR? flat flange on the side) & rebuilding it & if it's functioning right it's a killer carb. "the carb shop" in Eldon Missouri may have kits for it ($$$ but the very best) & if so you could get richer rods/jets for it as he mfrs them (wont sell rods/jets seperately)


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Re: Help wtih carb choice, please...LA 360 rebuild [Re: gdonovan] #1585052
03/02/14 11:27 AM
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A picture for myself is not needed BUT a very good idea to post up for new to TQ guys.
Also. If you can, posts picture of an AVS on the same topic. Both shots from the air door adjustment side would be great. Just to show the slight differences in the air door adjustment screws set ups.

Just to throw my 2 cents into this, I like the Carter's better. Personal choice. I have no issue with Holley what so ever. I can tune either carb. Been doing so for 20 years. I just like the Carter's. Not a AFB fan myself, but I do love the AVS and the TQ is my favorite.

Re: Help wtih carb choice, please...LA 360 rebuild [Re: RapidRobert] #1585053
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Quote:

I'd suggest getting an early TQ (not sure the cutoff year but none with the EGR? flat flange on the side) & rebuilding it & if it's functioning right it's a killer carb.




Normally I'd agree but with the availability of the Street Demon for $350 I think that is the way to go now. New unit, tuning kits available, how can you go wrong?

I have 4 TQ's here including a new one with electric choke, the opportunity to buy a new TQ in the cfm range of need is too good to pass up.

I keep hoping they bust out a new unit in the 900 cfm range and I'll snap one up.




"I think its got a hemi"
Re: Help with carb choice, please...LA 360 rebuild [Re: gdonovan] #1585054
03/03/14 12:27 AM
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Charger_440 Offline OP
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ok, good info guys. let's refocus this thread once more. say I use the stock spread bore intake I have...let's talk about carb options that will bolt onto that manifilold. the tq is out just due to the cfm being too much for my build.

we have the street demon and the quickfuel mentioned above. what are some other good carbs in the pricerange between 650 and 750 cfm?

I prefer vacuum secondaries

Last edited by charger_440; 03/03/14 12:31 AM.

In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585055
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Quote:

ok, good info guys. let's refocus this thread once more. say I use the stock spread bore intake I have...let's talk about carb options that will bolt onto that manifilold. the tq is out just due to the cfm being too much for my build.




Ummmm, sorry, but that is completely inaccurate since TQ's came on 318's in the lTe 70's with power ratings of 180 HP. (Maybe less even )

If you can find a good working unit, just use the small primary TQ.
That is IF you want to use a TQ. Take the CFM rating out of your head because it is misleading you. The small primary large secondary design of a spreadbore carb make them flexable enough to use on your mello build, which is a little bit more than stock right?
The worst you'll have to do is change a rod.

Re: Help with carb choice, please...LA 360 rebuild [Re: Rob C] #1585056
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The TQ is out because the OP says he prefers a vacuum secondary style carb.

Besides, he also said that he already had a Street Demon. If he doesn't want to run that one, he sure wouldn't want an old TQ.


Master, again and still
Re: Help with carb choice, please...LA 360 rebuild [Re: Rob C] #1585057
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dogdays Offline
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First things first: If you are a relative newbie, buy a brand new carburetor. It's all right for the old hands to say Thermoquad, but to a newbie the TQ is chancy at best. Part and tuning supplies can be problematic, and the knowledge to tune one is rare. That being said, if you had a TQ guru living next door it would be an excellent choice.

Your first choice should be a Street Demon, 625 cfm. It will bolt onto your stock spreadbore intake. Get the one with the plastic center section. Dunnuck says it is almost perfect out of the box, and I believe him.

You are working under a number of misconceptions.

1. Any carburetor with an adjustable air door or vacuum secondaries can be made to work with your 360. Read my previous post again. Spreadbores especially work for any kind of engine because the small primaries do a lot of the work. An 800 Thermoquad is not too big for your engine. Period. Or a 750cfm Quadrajet, etc.

2. Vacuum secondaries have the same function as a tunable air door so there is no advantage to going that way, except that all vacuum secondary carbs are Holleys, and Holley tuning knowledge and parts are widespread.

3. Quick Fuel Technologies, Barry Grant and Holley are all Holley designed and built carburetors The only new carb you are likely to see that ISN'T built by Holley is the Edelbrock.

A Thermoquad hasn't appeared new on a car or truck for decades. But give Holley (BG) credit for building the Street Demon, a brand new carb that keeps the best qualities of a TQ while being all new and bolting on either squarebore or spreadbore intakes without adapters. It also looks a lot like a carb that is supposed to be sitting on top of a 360.

R.

Re: Help with carb choice, please...LA 360 rebuild [Re: dogdays] #1585058
03/03/14 04:20 PM
03/03/14 04:20 PM
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Tulsa, Oklahoma
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Charger_440 Offline OP
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so, although it is an 800 cfm, it doesn't act like one? it can be choked down? if its true that they're as adjustable as they need to be, then I wouldn't mind a tq. does it really just throw as much fuel as the engine asks for? that would negate the above arguments over this carb or thay being too large or too small...I am not a newbie but also dont have any experience tuning a tq.
youre sure that with proper tuning the tq wouldnt drown my 360?

what makes them hard to tune just a lot of adjustments, or what? how do I tune one? lay it on me. lol

at 625 isnt the demon a little small?

Last edited by charger_440; 03/03/14 06:43 PM.

In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: dogdays] #1585059
03/03/14 07:34 PM
03/03/14 07:34 PM
Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan Offline
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Oakdale CT
Quote:

First things first: If you are a relative newbie, buy a brand new carburetor. It's all right for the old hands to say Thermoquad, but to a newbie the TQ is chancy at best. Part and tuning supplies can be problematic, and the knowledge to tune one is rare.




Exactly why I stated if looking for a "TQ" then the Street Demon is the way to go, I'd get the 750 cfm unit for a 360.

Its new, parts are easy to get and the price is excellent.

See my Duster? 5.9 Magnum with a 750 cfm Carter and I can blow the tires away with 3.55's with no trouble at all.




"I think its got a hemi"
Re: Help with carb choice, please...LA 360 rebuild [Re: DaveRS23] #1585060
03/03/14 10:20 PM
03/03/14 10:20 PM
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Rob C Offline
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Quote:

The TQ is out because the OP says he prefers a vacuum secondary style carb.




While the TQ isn't exactly a vacuum operated secondary carb, it should be considered one. While the butterfly operation of the carb is strictly mechanical in nature, the air door above it is velocity sensitive. As the engine demands more air, and with the secondary butterflies opened, the air starts to move past the top air door at an increasing rate. As the velocity of the air becomes great enough to over come the air doors springs tension, it opens.

There is also a vacuum choke pull off tube/passage that will cancel this operation.


Quote:

Besides, he also said that he already had a Street Demon. If he doesn't want to run that one, he sure wouldn't want an old TQ.




Besides? Is not needed here because I was mentioning the misconception into a correction and understanding as to why and what I wrote. Please re-read thoroughly and not assume of me, thanks. I'm not trying to convince him to use one.

Also, I agree that a new guy would probably be overcome with a TQ. Even more so, into frustration if it is not in good shape. Vacuum and or fuel leaks at the shafts or where the gaskets are can be a huge pain to deal with. Actually, there is a lot to deal with on this carb.
IMO, it is not really for the meek or untalented.

However, IMO, once you learn the carb, there a blast. I mostly find them inexpensive to obtain and rebuild. To say there a great bang for the buck is a understatement considering dollar spent vs. CFM obtained. There is a learning curve with these carbs. How much of a curve is up to the person themselves.

Re: Help with carb choice, please...LA 360 rebuild [Re: dogdays] #1585061
03/03/14 10:23 PM
03/03/14 10:23 PM
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Rob C Offline
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First things first: If you are a relative newbie, buy a brand new carburetor. It's all right for the old hands to say Thermoquad, but to a newbie the TQ is chancy at best. Part and tuning supplies can be problematic, and the knowledge to tune one is rare. That being said, if you had a TQ guru living next door it would be an excellent choice.




Charger440;
That's the home run in the bold! You'll be way a head of the curve.
And yes, the TQ can be "Choked down" though it should be said, tuned down. The engine will demand only so much air and the TQ will give what it wants, and that's it. Without getting into a long drawn out post, you have the idea.

There is a book on everything you wanted to know about Carter carbs (And Edelbrocks too) plus some info that only rates as interesting to know. But it is a good read. Pick on up and enjoy it. It's good to have on the shelf.

Last edited by Rob C; 03/03/14 10:29 PM.
Re: Help with carb choice, please...LA 360 rebuild [Re: Rob C] #1585062
03/03/14 10:41 PM
03/03/14 10:41 PM
Joined: Jan 2003
Posts: 11,891
Benton, IL.
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DaveRS23 Online rolleyes
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Quote:

Quote:

The TQ is out because the OP says he prefers a vacuum secondary style carb.




While the TQ isn't exactly a vacuum operated secondary carb, it should be considered one. While the butterfly operation of the carb is strictly mechanical in nature, the air door above it is velocity sensitive. As the engine demands more air, and with the secondary butterflies opened, the air starts to move past the top air door at an increasing rate. As the velocity of the air becomes great enough to over come the air doors springs tension, it opens.

There is also a vacuum choke pull off tube/passage that will cancel this operation.


Quote:

Besides, he also said that he already had a Street Demon. If he doesn't want to run that one, he sure wouldn't want an old TQ.




Besides? Is not needed here because I was mentioning the misconception into a correction and understanding as to why and what I wrote. Please re-read thoroughly and not assume of me, thanks. I'm not trying to convince him to use one.

Also, I agree that a new guy would probably be overcome with a TQ. Even more so, into frustration if it is not in good shape. Vacuum and or fuel leaks at the shafts or where the gaskets are can be a huge pain to deal with. Actually, there is a lot to deal with on this carb.
IMO, it is not really for the meek or untalented.

However, IMO, once you learn the carb, there a blast. I mostly find them inexpensive to obtain and rebuild. To say there a great bang for the buck is a understatement considering dollar spent vs. CFM obtained. There is a learning curve with these carbs. How much of a curve is up to the person themselves.




Rob, I don't necessarily disagree with you. I was merely addressing the OPs concerns.

Your job is to convince the OP that your points are valid to him. He has been told on here by several posters that the Street Demon is his best chance for OOTB success. He said that is not the way he wanted to go. You want to convince him otherwise.

Good luck.

The TQs are okay. But they are the last carb that I would recommend to anyone that is asking for advice here.

I meant no disrespect. I was only trying to clarify the OP's position.



Master, again and still
Re: Help with carb choice, please...LA 360 rebuild [Re: DaveRS23] #1585063
03/03/14 11:38 PM
03/03/14 11:38 PM
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Posts: 715
Tulsa, Oklahoma
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Charger_440 Offline OP
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I didnt ever say I had a street demon. I dont have a carb at all yet, so I hadnt said I didnt want the demon. im taling all info in and learning from it. I am, from what I am seeing here, leaning strongly towards the street demon 750.

I appreciate everything that all of you have contributed and are contribiting to the thread.


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585064
03/03/14 11:50 PM
03/03/14 11:50 PM
Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing Offline
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Northern Indiana
The 625 version is enough carburetor for a mild 360 unless you plan on some major upgrades. On the dyno, measured airflow on my test mule was less than 600 cfm with any carburetor I tested on it. Test carburetors ranged from the 625 up to a Holley HP950 that utilizes a venturi size similar to a 750.
I'll see if I can find the cfm comparison sheet or print out a new one. Too big of a carburetor reduces the signal due to lack of vacuum at wide open throttle.
Keith

Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585065
03/04/14 12:04 AM
03/04/14 12:04 AM
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Posts: 11,891
Benton, IL.
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DaveRS23 Online rolleyes
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Quote:

we have the street demon and the quickfuel mentioned above. what are some other good carbs in the pricerange between 650 and 750 cfm?

I prefer vacuum secondaries





I misunderstood what you meant by "we have a street demon". And are you now rethinking your position on the secondary actuation?


Master, again and still
Re: Help with carb choice, please...LA 360 rebuild [Re: Dunnuck Racing] #1585066
03/04/14 02:39 AM
03/04/14 02:39 AM
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Rob C Offline
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Quote:

The 625 version is enough carburetor for a mild 360 unless you plan on some major upgrades.
Keith



Bingo and bingo again!

I had a 79- 360 that I used a Fed-Mougal made Carter 625 AFB on top of a iron TQ intake. Factory exhaut manifolds into a dual exhaust. It was a nice upgrade. While not a big fan of an AFB, it did scoot along real well.

Re: Help with carb choice, please...LA 360 rebuild [Re: Rob C] #1585067
03/04/14 08:26 AM
03/04/14 08:26 AM
Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan Offline
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Quote:

The 625 version is enough carburetor for a mild 360 unless you plan on some major upgrades.
Keith




Normally I'd agree with the statement but I keep circling back to my Duster- Stock bore 5.9, Enginequest heads with 1.88 intakes, Edelbrock RPM intake and a Compcams roller and exhaust manifolds.

The engine is mild enough I have power brakes and a stock converter but would draw a vacuum at WOT after a second or two. Classic indicator of being under carb'd.

Replaced with a 750, problem gone. I say problem because it was popping the overdrive back on, I have a vacuum switch for OD override.

I guess the question would be the definition of mild build. If it is a stockish build then for sure lean towards the 625, anything more and I'd say the 750.




"I think its got a hemi"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585068
03/05/14 01:39 AM
03/05/14 01:39 AM
Joined: Aug 2007
Posts: 2,356
Kentucky
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dfsmopars Offline
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Kentucky
Let me see if I can help. I have 5.9 Magnum, KB .04 over pistons. Air gap intake, Hughes roller cam, Indy x heads. Headers, MSD ignition. I am currently running a 625 Carter that works pretty good but bogs. Tried an Eddy 750 and it killed the engine. I think the 625 Street demon sounds good for my set up and the ops. I think I'd like a 670 Street Avenger. Had a 770 on a 383 that worked perfectly.


‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
Re: Help with carb choice, please...LA 360 rebuild [Re: dfsmopars] #1585069
03/05/14 02:00 AM
03/05/14 02:00 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
Quote:

I am currently running a 625 Carter that works pretty good but bogs.


More info as we might be able to help you fix what's going on with it. I ain't a CFM problem (625/5.9) tho you have a pretty healthy build it should not be bogging


live every 24 hour block of time like it's your last day on earth
Re: Help with carb choice, please...LA 360 rebuild [Re: dfsmopars] #1585070
03/05/14 07:13 AM
03/05/14 07:13 AM
Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan Offline
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Oakdale CT
Quote:

I am currently running a 625 Carter that works pretty good but bogs.




Then you have some other problem if it bogs with a 625.

I'd be more than happy to let anyone drive the car if they are in SE CT and they can see for themselves how the car runs and throttle response.




"I think its got a hemi"
Re: Help with carb choice, please...LA 360 rebuild [Re: Dunnuck Racing] #1585071
03/06/14 12:02 AM
03/06/14 12:02 AM
Joined: Aug 2007
Posts: 2,356
Kentucky
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dfsmopars Offline
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Kentucky
Quote:

I was down at the Indy Cylinder Head trade show and swap meet today where I ran into Randy Bolig. He told me the article I wrote for him (Mopar Muscle) where I tested several carburetors on a mild 360 will be in print in the next couple of months.
If you can wait that long please do yourself a favor and read it before you make a decision. Some people's old favorite type carburetors dont hold up so well.
And no matter how the secondary side is adjusted doesn't matter when the metering is all wrong for today's fuels,.....
Keith



Yes I am very interested in reading the article.


‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
Re: Help with carb choice, please...LA 360 rebuild [Re: dfsmopars] #1585072
03/06/14 02:00 PM
03/06/14 02:00 PM
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Posts: 715
Tulsa, Oklahoma
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Charger_440 Offline OP
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Tulsa, Oklahoma
ok, so, silly question, but, hey, this is how we learn... if i see a carb advertised as a "chevy carb" or "ford carb" is this just a difference in linkages? or is it also a difference in the mounting pad bolt spacing?

i.e. (and i am not looking at used carbs) a lot of what you see listed on craigslist is used stuff, you see, for example, holley 4 barrel small block chevy, or quadrajet replacement

how do i know what would bolt onto that OEM 360 cast manifold?


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585073
03/06/14 02:52 PM
03/06/14 02:52 PM
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Rob C Offline
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Most aftermarket carbs come with a Chavy linkage. You would have to purchase an adapter for the carb to get the linkages to line up.

If it is advertised as a Ford carb, then that linkage if for a Ford.

Seldom do the carbs come with a "MoPar " linkage set up.

If I got this right ...
The OE iron intakes use Carter's. Any Edelbrock will bolt on because of the dual bolt holes on each corner of the carb mounting pads. If the Holley does not have this, then it will not bolt on a OE intake. Save certain car/model/engine packages that came with a Holley from the factory.

On your OE small block intake, you can readily bolt on any Edelbrock. Look carefully through the Edelbrock catolog.

Re: Help with carb choice, please...LA 360 rebuild [Re: Rob C] #1585074
03/06/14 03:43 PM
03/06/14 03:43 PM
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Tulsa, Oklahoma
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Charger_440 Offline OP
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Thanks for the reply Rob.
I've got an Eddy 650 on my 71 javelin, and i dont know if I'd want another. It seems a little finicky.


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585075
03/11/14 02:04 PM
03/11/14 02:04 PM
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Posts: 715
Tulsa, Oklahoma
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Charger_440 Offline OP
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Tulsa, Oklahoma
Thank you again guys for all of the info and opinions. I did end up going with the street demon 625. i figure since i want to go fuel injected in teh next couple of years, at leat i can use this carb on one of my other cars. None of the others have enough motor to use a 750 at all. lol.

thanks again everyone!! Much Appreciated.


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585076
03/12/14 12:01 AM
03/12/14 12:01 AM
Joined: Jan 2003
Posts: 11,891
Benton, IL.
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DaveRS23 Online rolleyes
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Keep us posted on your experience with it. Where did you get it?


Master, again and still
Re: Help with carb choice, please...LA 360 rebuild [Re: DaveRS23] #1585077
03/12/14 02:18 PM
03/12/14 02:18 PM
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Posts: 715
Tulsa, Oklahoma
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Charger_440 Offline OP
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Tulsa, Oklahoma
I got it at gran prix speed shop in tulsa. Itll be a week or two before I can assemble the engine. Unwrapped the rebuilt engine to find it dirty and all internals still rusty. Had been wire brushed not hot tanked, grit in the assembly lube and all in the bottom end.....its going bk to the shop on saturday. We have used this shop before, never had this issue in the past


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585078
03/12/14 09:23 PM
03/12/14 09:23 PM
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Posts: 11,891
Benton, IL.
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DaveRS23 Online rolleyes
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Good thing you caught that!


Master, again and still
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585079
03/12/14 09:35 PM
03/12/14 09:35 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Quote:

Unwrapped the rebuilt engine to find it dirty and all internals still rusty. grit in the assembly lube and all in the bottom end


Post what they say


live every 24 hour block of time like it's your last day on earth
Re: Help with carb choice, please...LA 360 rebuild [Re: RapidRobert] #1585080
03/14/14 05:02 PM
03/14/14 05:02 PM
Joined: Jan 2003
Posts: 715
Tulsa, Oklahoma
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Charger_440 Offline OP
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Tulsa, Oklahoma
the guy i talked to was very surprised to heaar this, and glad to make it right. He was glad that I caught it as well. He told me to bring it by and he would get them to re-rebuild it and ensure that it's right this time.

Last edited by charger_440; 03/14/14 05:03 PM.

In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
Re: Help with carb choice, please...LA 360 rebuild [Re: Charger_440] #1585081
03/14/14 09:34 PM
03/14/14 09:34 PM
Joined: Sep 2007
Posts: 14,889
up yours
Supercuda Offline
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Quote:

I got it at gran prix speed shop in tulsa. Itll be a week or two before I can assemble the engine. Unwrapped the rebuilt engine to find it dirty and all internals still rusty. Had been wire brushed not hot tanked, grit in the assembly lube and all in the bottom end.....its going bk to the shop on saturday. We have used this shop before, never had this issue in the past




HTH can you have a dirty "rebuilt" engine.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Help with carb choice, please...LA 360 rebuild [Re: Supercuda] #1585082
06/05/14 07:29 PM
06/05/14 07:29 PM
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Posts: 715
Tulsa, Oklahoma
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Charger_440 Offline OP
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Tulsa, Oklahoma
well......that's the longest week or two I've ever experienced. Today, they FINALLY got the engine finished up and it's being delivered by the shop this evening.
It has been one complete fiasco after another. Lies, excuses, delays, etc. but in the end, it's finally done, and finally correct. They not only did the warranty work to rebuild it right, but, in order to make this all right by me; they also did, for free, bronze guides, hardened seats, 3 angle valve job, and internal balancing. The engine, this time, actually looks like a rebuilt engine should. It's clean, well lubed, everything is right1 I am a happy camper!

Does anyone know what the typical toleranaces are for internal balancing? Their performance guy wasnt there when I was, but the manager kept commenting on how well it balanaced out and how smooth it should be. He said it balanced to within either 5 thousandths or 5 hundred thousandths. He couldnt remember which.

Come to find out, today, at this ENGINE REBUILD SHOP their only engine builder is only there 5 hours a day and their performance guy is only there 3 hours a day. The manager actually said "The other guys might do some mechanic work back there, but after 2PM, basically all we do is answer the phone."

All I could do was shake my head. I'm just glad to have it finished and be done with them. Now, i just hope that it's all as right when ig et it on the engine stand as it appearded to be in the shop.


In a conversation with a Wyoming State Patrolman... "A 318 ??!!! But I clocked you at 142 mph!!!"
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