Help with carb choice, please...LA 360 rebuild
#1585024
02/27/14 05:23 PM
02/27/14 05:23 PM
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Joined: Jan 2003
Posts: 715 Tulsa, Oklahoma
Charger_440
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 715
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!!!"
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: Charger_440]
#1585025
02/27/14 05:56 PM
02/27/14 05:56 PM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
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..
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: 340SHORTY]
#1585026
02/27/14 06:10 PM
02/27/14 06:10 PM
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Joined: Jan 2003
Posts: 715 Tulsa, Oklahoma
Charger_440
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super stock
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super stock
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Tulsa, Oklahoma
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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!!!"
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: 340SHORTY]
#1585027
02/27/14 08:40 PM
02/27/14 08:40 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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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)
live every 24 hour block of time like it's your last day on earth
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: RapidRobert]
#1585028
02/27/14 08:50 PM
02/27/14 08:50 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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spread-bore: Thermoquad square-bore: Holley 670 Avenger series.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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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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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
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.
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: Supercuda]
#1585034
02/28/14 12:02 AM
02/28/14 12:02 AM
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Joined: Apr 2007
Posts: 4,233 petaluma,ca. u.s.a.
west
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master
Joined: Apr 2007
Posts: 4,233
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.
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: gdonovan]
#1585038
02/28/14 07:32 PM
02/28/14 07:32 PM
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Joined: Jan 2003
Posts: 715 Tulsa, Oklahoma
Charger_440
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super stock
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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!!!"
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: gdonovan]
#1585040
02/28/14 07:56 PM
02/28/14 07:56 PM
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Joined: Jan 2003
Posts: 715 Tulsa, Oklahoma
Charger_440
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 715
Tulsa, Oklahoma
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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!!!"
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Re: Help wtih carb choice, please...LA 360 rebuild
[Re: Beebuzzn]
#1585043
02/28/14 10:45 PM
02/28/14 10:45 PM
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Joined: Jan 2003
Posts: 715 Tulsa, Oklahoma
Charger_440
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 715
Tulsa, Oklahoma
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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!!!"
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