Need more Quickness
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3rd Gear
Joined: Mar 2008
Posts: 3
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Need more Quickness
Hi
I just added a Edlebrock Preformer cam and Manifold kit with Headman headers on my stock 350 "75". I have a Rochester 600cfm 4 barrel.I was told to go with a Holley 4 barrel 600cfm. Would it make a difference?
I just added a Edlebrock Preformer cam and Manifold kit with Headman headers on my stock 350 "75". I have a Rochester 600cfm 4 barrel.I was told to go with a Holley 4 barrel 600cfm. Would it make a difference?
Last edited by John75; Mar 21, 2008 at 06:27 PM. Reason: missed a word
Race Director
Joined: Jun 2000
Posts: 10,040
Likes: 672
From: FL
Carb swap will have no real effect other than to lighten your wallet.
For a real boost, replace the cam. That Edelbrock cam is too mild and designed for trucks. For a stock L-48, shoot for something with ~210@.050 lift. My first cam in my '75 was a Crane Powermax 272 (about 212@.050"). Worked great.
Also, never heard of a 600cfm Rochester. Do you mean a 600cfm Edelbrock? If you still have the stock Q-Jet, reinstall it. 750cfm and a much better carb. The Edelbrock is just an old Carter AFB clone, which GM replaced with Q-Jets. I am pushing 400hp with a tuned Q-Jet.
For a real boost, replace the cam. That Edelbrock cam is too mild and designed for trucks. For a stock L-48, shoot for something with ~210@.050 lift. My first cam in my '75 was a Crane Powermax 272 (about 212@.050"). Worked great.
Also, never heard of a 600cfm Rochester. Do you mean a 600cfm Edelbrock? If you still have the stock Q-Jet, reinstall it. 750cfm and a much better carb. The Edelbrock is just an old Carter AFB clone, which GM replaced with Q-Jets. I am pushing 400hp with a tuned Q-Jet.
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
A properly set up Q-jet will perform as good as any Holley. There are some VERY fast GS Buick's running around here. I didn`t believe they could go that fast, especially with all the weight there hauling. Made a believer out of me. 
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
Couldn't agree more. 
