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#2416017 - 12/09/17 10:54 PM Carb suggestions, looking at going Holley
Belvedere1 Online   content
super stock

Registered: 01/20/03
Posts: 1157
Loc: Phoenix, AZ
I'm looking to go from an Edelbrock 800 to a 4150 type Holley.

The rundown on the car and combo is a 67 Belvedere, 727, 451 with Edelbrock heads ootb, RPM intake, 10.5 comp, .520-254 solid cam, 9.5 converter, 4:10. This is street car but not interested in an electric choke as I have never used one being in Phoenix. If I decide to go that route it seems this time of year is as about as cheap as I am going find prices.

What carb would you guys recommend here?

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#2416041 - 12/09/17 11:30 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
MR_P_BODY Offline
Master

Registered: 06/13/03
Posts: 50954
Loc: Romeo MI
You might want to think EFI
wave
_________________________

W-9 8.94 @ 151 NOW ON E-85
Mike "Raff"...(180)Watching over us
CAR IS FOR SALE

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#2416053 - 12/10/17 12:18 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31408
Loc: Bend,OR USA
On your deal a 850 to 1050 CFM double pumper 4150 HP carb. is what I would buy, maybe a similar Quick Fuel or one of your other favorite brand carbs. up
EFI with a single 1000 to 1250 CFM 4150 throttle body is as good or a tiny bit better (and not compatable (SP?) with the dual plane intake you have) but a lot more money to start with work shruggy


Edited by Cab_Burge (12/10/17 12:20 AM)
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2416122 - 12/10/17 09:33 AM Re: Carb suggestions, looking at going Holley [Re: Cab_Burge]
Belvedere1 Online   content
super stock

Registered: 01/20/03
Posts: 1157
Loc: Phoenix, AZ
I'm sticking with a carb on this. The basic 850 4781 model is what I was thinking. Thanks Cab.

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#2416128 - 12/10/17 09:43 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
BradH Offline
I Live Here

Registered: 01/30/03
Posts: 14041
Loc: Valhalla... eventually
A 4781 would be a good choice to put on an affordable carb that shouldn't need too much tuning to drive well on the street. If you are concerned about on-track performance as well, there are other carbs that will be quicker at the track, but may not be as happy cruising around town.

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#2416137 - 12/10/17 10:14 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
DaveRS23 Offline
master

Registered: 01/20/03
Posts: 4736
Loc: Benton, IL.
The Holley 850DP is calibrated as a track carb. It will be very fat for a street car OOTB.

If you are comfortable with tuning the cruise and transitions, it would work for your application.
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KOS

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#2416143 - 12/10/17 10:29 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
krautrock Offline
top fuel

Registered: 01/27/03
Posts: 1769
Loc: central texas
i think you'd be better off buying one of the quick fuel carbs.
maybe an HR or a SS carb, being able to tune the idle feed restricter is pretty nice on a street car.

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#2416174 - 12/10/17 11:10 AM Re: Carb suggestions, looking at going Holley [Re: MR_P_BODY]
AndyF Online   content
Too Many Posts

Registered: 01/20/03
Posts: 24669
Loc: Oregon
Originally Posted By MR_P_BODY
You might want to think EFI
wave


I agree. Something like a Sniper or the MSD Atomic for a car like that.

If you insist on a carb then I'd highly recommend something with billet metering blocks so you have a fighting chance at tuning it. The problem there is the better carbs with the latest features (idle air adjust, billet metering blocks, clear sight glass, etc.) are expensive. The really good carbs are close to $1000 and you still have to spend a few weekends with a screwdriver and a wide band to tune them.......

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#2416189 - 12/10/17 11:35 AM Re: Carb suggestions, looking at going Holley [Re: AndyF]
Belvedere1 Online   content
super stock

Registered: 01/20/03
Posts: 1157
Loc: Phoenix, AZ
Andy, are you referring to an HP type 4150? From what I understand the HP line doesn't flow what they are rated by Holley to flow. The throttle bores are smaller. The 950 HP is the same bore size as an 850 4781.

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#2416204 - 12/10/17 11:52 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
Iowan Offline
super stock

Registered: 05/23/15
Posts: 962
Loc: Lost in Time
I know this isn't a street carb but I'm going to buy a 750 for my little Ford, I've had great success with the 950 e-85 version on my Mopar. The shop that does my dyno work has been selling quite a few of them after working on mine.
https://www.summitracing.com/parts/hly-0-80804hbx
And yes the gass carbs are usually set up fat.
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Have a great day
Iowan

"obsolete is neat, the older I get the better I was"


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#2416219 - 12/10/17 12:10 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
Thumperdart Online   work


Registered: 07/12/04
Posts: 18917
Loc: State of confusion
Originally Posted By Belvedere1
I'm looking to go from an Edelbrock 800 to a 4150 type Holley.

The rundown on the car and combo is a 67 Belvedere, 727, 451 with Edelbrock heads ootb, RPM intake, 10.5 comp, .520-254 solid cam, 9.5 converter, 4:10. This is street car but not interested in an electric choke as I have never used one being in Phoenix. If I decide to go that route it seems this time of year is as about as cheap as I am going find prices.

What carb would you guys recommend here?


Any of the billet block/base-plate carbs can be dialed in easy enuff especially if you have a wide-band afr gauge...........I`d stay clear of Holley personally and go QF, Pro-form etc. but I prefer and build from BLP parts and at a minimum a cast alum. main body OR step up to a full boogie billet........... thumbs

EFI......... down down


Edited by Thumperdart (12/10/17 12:10 PM)
_________________________
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

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#2416231 - 12/10/17 12:24 PM Re: Carb suggestions, looking at going Holley [Re: Thumperdart]
GY3 Online   content


Registered: 12/13/13
Posts: 2498
Loc: Wichita
I have a Demon 850 and absolutely love it!

Lots of track days and street miles.
_________________________
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's
10.69 @ 128mph with 150hp shot of nitrous


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#2416273 - 12/10/17 01:16 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
BSB67 Offline
master

Registered: 02/19/05
Posts: 3596
Loc: Prospect, PA
What is your goal, what is your budget?

I've run a 4781 on mine and was surprised how well it ran from the minute I put it on. Bought it used for like $160 and rebuilt it.

I've run a small venturi 950 hp that probably flows about the same as a 4781 or a little less. It actually ran fatter than the 4781 and required more tuning. It did make a bit more power than the 4781.

I've run a lot of carbs over the years, and I really like my 950 hp style carb. Kinda drives like a 4779, but better power than a 4781.
_________________________
500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes 4150 lbs with driver, 3.23 gear, stock converter 11.68 @ 120.2 mph

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#2416285 - 12/10/17 01:29 PM Re: Carb suggestions, looking at going Holley [Re: DaveRS23]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31408
Loc: Bend,OR USA
Originally Posted By DaveRS23
The Holley 850DP is calibrated as a track carb. It will be very fat for a street car OOTB.

If you are comfortable with tuning the cruise and transitions, it would work for your application.

iagree
You will have to lean down the transition fuel feed to get it happy at light part throttle cruise scope up Try around .055 restrictors in each side on the primary transition circuits to start with up twocents You will have to drill and tap them to do that with brass set screws shruggy
If you don't have the tools, skill or desire to do that your self maybe you should contact Thumper about one of his carbs or have him mod yours for good results work up
I have four 4781 carbs. starting from a old non dash original to my latest one which is a 4781-7, they work good with jetting and modifying the transition circuits to lean them down up
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2416390 - 12/10/17 05:04 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
StealthWedge67 Offline
master

Registered: 07/19/06
Posts: 4140
Loc: Puyallup, WA
OP combo is almost identical to mine. I ran an 830 DP for years with pretty good success. Last year I switched to a Holley 1000 HP Annular Booster carb. Every aspect of the way the car ran improved, both street and strip, with the exception of gas mileage. I don't really keep track of mileage, but I feel as though it was a notable difference in the "less MPG” direction. No question however that the cars throttle response improved. I attributed this primarily to the Annular boosters. At the track, which I'm primarily concerned with, I gained 2 tenths

I felt pretty good about my choice and results.
_________________________
LemonWedge - Street heavy / Strip ready - 11.32 @ 117

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#2416463 - 12/10/17 07:21 PM Re: Carb suggestions, looking at going Holley [Re: StealthWedge67]
Belvedere1 Online   content
super stock

Registered: 01/20/03
Posts: 1157
Loc: Phoenix, AZ
I'll say the budget is around $500ish. I'm also not opposed to going with a good used carb. I can tune the Holley up to a point but when/if it comes to drilling and tapping and such I would farm that out to one of the carb gurus. (i.e. Thumper).

I'm just looking for carb that idles better than the 800 Eddy I have now mainly. The Eddy performs extremely well in all areas except the idle. I'm pretty much done with trying to tune it. I'm getting 10" of vacuum at idle and the metering rods are just bouncing up and down. Its like it cant figure which circuit its on - the idle or the main. I'm not looking for all out strip performance but something that works well on the street which is less than 500 miles a year with very short local trips here and there and then very very rare strip occasion. I figure if the thing runs a mid to high 11 then I'm happy with it.

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#2416470 - 12/10/17 07:29 PM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31408
Loc: Bend,OR USA
Either replace those springs with thinner ones or trim one or two coils off of them now and see if they will stay seated then scope up
Don't we love working on race cars whistling grin
_________________________
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2416484 - 12/10/17 07:43 PM Re: Carb suggestions, looking at going Holley [Re: Cab_Burge]
Belvedere1 Online   content
super stock

Registered: 01/20/03
Posts: 1157
Loc: Phoenix, AZ
I've ran every spring in the strip kit and ended up with the orange 5mmHg spring. Yeah this stuff can be aggravating at times.

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#2416649 - 12/11/17 01:29 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26889
Loc: Balt. Md
Myself I run your basic Holley 850 DP thats been on my 63 since 2006. Only after I had to jet up a good bit when I built my 493 did I notice it a tad fat at cruise but I just lean down IFR a bit. And I have been very happy with the driveability and performance of the carb. Its still very basic as all I have done is some jetting and P/V changes and some squirter work along with leaning the IFR a tad. Ron
_________________________
My car...63 Sport Fury Max Wedge wanna be street car..with new 493 pump gas full exh eng.......10.76 @ 124.49 ! ! ! My page on the cool 62-65 Mopar site ! http://www.1962to1965mopar.ornocar.com/mmo82008.html

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#2416686 - 12/11/17 08:06 AM Re: Carb suggestions, looking at going Holley [Re: Belvedere1]
BradH Offline
I Live Here

Registered: 01/30/03
Posts: 14041
Loc: Valhalla... eventually
If you don't use a choke, check out the Holley Days sale on the Quick Fuel "Brawler" 950. Don't freak about them calling it a 950 because the venturi size is only 1.45" vs 1.56" for a 4781. IIRC, the sale price is about $520 right now. It's Quick Fuel's version of the Proform 950, FWIW.

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