750 CFM too much for a 350 engine - Team Camaro Tech
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post #1 of 12 (permalink) Old Jul 14th, 06, 06:37 PM Thread Starter
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750 CFM too much for a 350 engine

I have a Edelbrock 1407 750 CFM ( Weber ) carburetor on a 350 CI engine with a mild cam. Is this the right carb for this engine? If so, what would you recommend? There are two screws on the front of the carb. Can somebody tell me how to adjust? Thanks.
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post #2 of 12 (permalink) Old Jul 14th, 06, 07:23 PM
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Re: 750 CFM too much for a 350 engine

750CFM sounds too big for a mild cam. IMHO, 600- 650CFM would be a better choice.
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post #3 of 12 (permalink) Old Jul 14th, 06, 07:32 PM
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Re: 750 CFM too much for a 350 engine

I'm running a holley 600 Vac sec on a comp 280H, 10.1:1 350. Runs great!

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post #4 of 12 (permalink) Old Jul 14th, 06, 08:51 PM
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Re: 750 CFM too much for a 350 engine

I removed the Holley 750 and edelbrock that was on mine when I bought it and went with Qjet 650 and cast iron manifold.. runs great and MUCH better mileage compared to the Holley, it was way to much.

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post #5 of 12 (permalink) Old Jul 14th, 06, 10:22 PM
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Re: 750 CFM too much for a 350 engine

For a 350 to need a 750cfm carb it needs to be built to the hilt and designed to spin way past 6k. With your set up you would be much happier with a 600 vac. secondary carb. It will give you better throttle response better drivability and better fuel economy. Not to mention easier to tune.


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post #6 of 12 (permalink) Old Jul 15th, 06, 01:48 AM
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Re: 750 CFM too much for a 350 engine

yup as others have said 750 is overkill unless you got some nice flowing heads big cam and high compression

BTW holley has an online questionaire on their site now that will give you an approximate CFM for your engine.
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post #7 of 12 (permalink) Old Jul 15th, 06, 09:48 AM Thread Starter
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Re: 750 CFM too much for a 350 engine

I think I will drop down to the Edlebrock 600. My 750 is mounted on a high intake plate. What is the advantage to this vs mounting it straight to the intake itself?
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post #8 of 12 (permalink) Old Jul 15th, 06, 09:52 AM
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Re: 750 CFM too much for a 350 engine

So, for decades, all the engines built by GM with Q-jets on them were all way over-carbed?
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post #9 of 12 (permalink) Old Jul 15th, 06, 12:32 PM
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Re: 750 CFM too much for a 350 engine

Quote:
Originally Posted by HwyStarJoe
So, for decades, all the engines built by GM with Q-jets on them were all way over-carbed?
The quadrajet has the tiny primaries, but the secondary top flap is opened via vacuum, so depening on the tuning whether or not they opened all the way or not.
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post #10 of 12 (permalink) Old Jul 15th, 06, 01:17 PM
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Re: 750 CFM too much for a 350 engine

G.M. had it right with those small primaries. I tried a 750 on my 327, way to big. Even the 600 I use now still has too large of primaries for my liking. I'd switch back to a Quuadrajet, but I'd have to get a new intake also, or use an adapter. Fuel Injection ? Maybe.

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post #11 of 12 (permalink) Old Jul 15th, 06, 01:27 PM
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Re: 750 CFM too much for a 350 engine

Use an adapter, they work just fine.
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post #12 of 12 (permalink) Old Jul 15th, 06, 01:41 PM
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Re: 750 CFM too much for a 350 engine

If the 750 was a vs carb it should be fine... but a smaller carb would increase throttle responce.

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