Too much carb for my motor???

I just purchased a new holley carb for my 52 chevy.... from what i know its a double pump 750cfm and I only have a bone stock 305 with a dual plane chevy performance intake manifold.... I know its too much carb for my motor but for what i paid for it i coulndt p*** it up...... so i guess my questions is should i just run it on my motor or should i try to get another carb thats smaller?? thanks.

 

A 600 would be aplenty.

 

Sell it and buy a 600 vac. secondary, good street carb and user freindly

 

So, basically... you found a smokin' deal on a 'new' 750 DP so you bought it... and your question is whether you should run it on your 305 or get a smaller carb...?

Get a smaller carb.

 

I currently have a edelbrock 650cfm now..... and I have had nothin but problems with it.... I have had a few people look at it and try to adjust it and I get nowhere with it.... So everyone that i talke to told me to get rid of the edelbrock and get a holley carb. well i did that but now i got too much of a carb

 

You don't adjust them from the outside. Maybe that is the problem.
Put a quadrajet back on.
"Make the suspension adjustable and they will adjust it wrong -- look what they can do to a Weber carburetor in just a few moments of stupidity with a screwdriver." - Colin Chapman

 

Quick example, I have a 502 with a factory 850 cfm.
Yes the 750 is to big.

This would be a much better choice,

600 CFM Four Barrel Street Carburetor
Holley PART #: 0-1850S

 

So how good of deal is it really if you can't use it for your application? Sell it and get a 4150/4160 (can't recall exact number) Holley 600cfm vac secondaries electric choke, no more problems.

 

500 or 600 is fine for a 305. I have a 600 cfm Edelbrock, but I reaaaaally want a 500 cfm Edelbrock. Something tells me it's going to run a bit better...

 

yes

 

well so that you can understand me more and dont think iam dumb for buying too big of a carb I only paid a grant for it!!!! !!!!!!

 

500CFM is about perfect for a 305.....
Pat

 

Go to Edelbrock website and read the tech info for your carb... if needed, change the jets/metering rods back to originals that came in the carb. Almost guaranteed to be just fine for your application.

 

Good advice from Blake, 750 will throw a little to much fuel at the 305. One of the biggest mistakes on small blocks, to much juice. ~Sololobo~

 

I work at a toyota dealership and a few of the techs here told me to rejet it with smaller jets???

 

that' won't help....it still has the problem of being too big, which makes the airflow at full throttle, low RPM situations too slow to "pull" fuel thru the jets.

 

I've often wondered how changing jets will change the CFM of a carb. CFM is the air flow of the carb, not the air/fuel ratio.
Larry T

 

If you only work on efi stuff, I guess you can say whatever you want about carbs?

 

well that was just a suggestion that was made and the techs that i talked to have older cars and stuff like that..... like i said i am well aware that the carb is too big but i just wanted to get feedback from the hamb..... and well for 50 bucks and a brand new carb who can beat that!!!!

 

Honestly, a nice 2 barrel would be great on a small bore 305. I had an afb and a holley 600 vac secondary on the 305 roller cam in my 53. both got aweful mileage, but ran well. I'm sticking with a qjet this time.

 

It's the right size for a 305 at 9500 rpm...

 

A 500 CFM would probably have the perfect jetting for a stock 305 and will get good mileage. A Holley 2-bbl wouldn't be bad, either.

 

good mileage isnt a big concern to me..... if i wanted good gas milage i would have made the first ever bydrid 1952 chevy hahahahaahahah and my gas pedal would have got stuck too hahahah!!!! but instead i put a small block.... at this point all that iam looking for is a carb that wont give me a bunch of **** when i wanna drive my car!!!

 

600 should be all you will need. I've got a 650 on my 350, with a bigger cam and it's plenty for street rodding stuff. At street driving rpm's, 750's just a waste of gas and to much airflow for the 305. My .02

 

anyone close to me wanna trade a 600cfm holley for my 750!!! hahahah

 

Just run the 750. I do not know the specifics of your engine, but if it's a 305, then I would be inclined to think that it idles real smooth, and thus pulls good idle vacuum. You should have no problems getting it to idle with the 750, and most of your driving will be done on the primary front ****erflies until you tromp it down, since a double pumper carb has a progressive system for the rear ****erflies. You can jet it by reading the plugs, and you'll be able to get it to run decent. I have had many 750s on little 302s in the past, and they all ran real well.

It will take an afternoon of tinkering to get the jetting perfect, so I hope you are prepared to spend some time, but it will work well in the end.

 

Go find yourself a 600 Holley with vacuum secondaries. Great street carb. I have motors with Holleys and Edelbrocks, but I've never been happy with the Edelbrock's performance. The Holley equipped motors run much better, just gotta mess with them every so often

 

I'd run a Holley 4412 500cfm. It'll give you good low end tourque and save on gas.

 

This is what hot rod carbs look like. Now go get some.

 

you know what your on to something that would solve all my problems!!! hahahah