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-   -   What holley 750cfm carb to go with ??? (http://www.hotrodders.com/forum/what-holley-750cfm-carb-go-24215.html)

FiefSS 09-24-2003 06:33 PM

What holley 750cfm carb to go with ???
 
The time has come for my project car to get a new carburator. To start with it is a 1969 302 with stock bottom end, double hump heads trimmed so compression is around 12-1 to 12.5-1. Intake is a classic edelbrock tarantula. Hooker comp headers with full 3 inch exhaust will be used and we are using a electric fuel pump if that matters :)

With the old 750cfm holley my dad had on the motor which came from a 67-69 vette it would bog down big time, but it also did that with tiny carb. We are really lookin for power above 4k rpm where it should be for a 302, but dont want to over due it :)

I was lookin at the 750 dominator but wasnt sure if this is a good choice. We are planning on goin back once we get the car driving and if its not "fast" enough adding some more to it. But I dont really wanna spend more $$$ changing carbs again. So what should we be lookin for? We know its got to be a holley and wanted to put a 750cfm carb back on. But which one would be the best choice? This is the one place where we will spend the big bucks if need be and if a dominator will be the best choice we will go for it.

What do ya guys think ?????



Thx, adam;)

1BAD80 09-24-2003 06:39 PM

If this is a daily driver a 750 #3310 vacuum secondaries, for race & play a 750 HP it the ticket.:thumbup:

2wld4u 09-24-2003 06:40 PM

Id use a HP 750 instead of the dominator..I use part # 80528-1

FiefSS 09-24-2003 06:43 PM

Its gotta be "streetable" in a sense but its not gonna run nice, just dont want to go overboard to the point it hurts the engine more than it helps :)

jrhoss 09-24-2003 08:47 PM

the 750 dominator needs a special intake to work properley and 2-300 more than a normal 750. a demon carb would probly work well if the motors pretty stout, but again its expensive

78 monte 09-25-2003 12:44 AM

Why not rebuild the old 750???Was it a double pumper??
Pretty much what ever you buy will need to be taylored to your motor anyway,so I would just(unless its shot)rebuild the existing carb using propperly matched power valves,then jet it and play with ecelerator pump cams.
If you do buy one I'd say just a 750 double pumper.I think the factory Z28s came with a 780 DP.

1BAD80 09-25-2003 08:39 AM

I agree with 78 monte rebuild it, not hard to do if you follow the instructions.
Holly Rebuild and Adjustment Instructions
http://www.holley.com/HiOctn/TechSer.../Instruct.html
If you need any help while rebuilding please post the question.
George

jhama78 09-25-2003 10:12 AM

750
 
Go get a proform main body and clean and rebuild the 750 that you have, you will be out only around $120 or so for the main body and gaskets and will have a fresh carb that runs great. I have one on my 383 and love it.

l8r

-j-rOd

cobra 28 09-25-2003 11:08 AM

If I were you I would go with the DEMON carb more smoother and better performance than the Holley would ever think of being. And unless you have over 400 hp I would go with their 650 size carburetor. TO many people think they need a 750 when they do not, plus there 650 is larger than the holley 650. Do not use the 750 Dominator not worth having on the street.

Tech @ BG 09-25-2003 03:19 PM

You could go with either a 650 or 750 Mighty Demon on your combination (Both less expensive than an HP).

A 650 Would probably give you better acceleration, and drivability especially with the large exhaust system.

The 750 would pull harder if you turn the engine over 7500 RPM

FiefSS 09-25-2003 05:45 PM

its gonna have to pull over 7500rpm :) since thats where its power is made. My dad has had plenty of carbs on it from old 450cfm 2 barrels to a 800 something 750 seemed to be the best so we are gonna stick with that. Even if the carb has been sitting for like 18 years and even when it was put away had a ton of miles If i were to rebuild it would it still be as good as new? And how do I clean this thing off? Its mighty dirty:)

well then my dad forgot to mention he didnt know what the carb was, and as it turns out its just a 585 :( so then i need new one i guess!

Jmark 09-25-2003 06:20 PM

[size=8] Q-jet all the way!!!![/size]

1BAD80 09-25-2003 07:03 PM

[QUOTE]Originally posted by FiefSS
[B]its gonna have to pull over 7500rpm since thats where its power is made. Intake classic edelbrock tarantula a winner for a 302.

Can you Please tell me what cam you have?
With a stock bottom end, and AT OVER 7500, double hump heads trimmed so compression is around 12-1 to 12.5-1.

This is one great motor, how much HP do you think it will make?

DoubleVision 09-25-2003 07:31 PM

I`m in agreements with 1BAD80, not enough info here. Although, I could say much more, I`m not gonna, I would rather wait to see how this turns out. another one tryin to sneak up the horsepower ladder. best of luck,,, your gonna need it.

78 monte 09-25-2003 07:33 PM

Quote:

Originally posted by Jmark [size=8] Q-jet all the way!!!![/size]
He wants high performance,not high blood pressure.:D
Allthough they do make good wheel chucks in a pinch.


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