Over fed 350 - Team Camaro Tech
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post #1 of 4 (permalink) Old Oct 11th, 05, 11:10 PM Thread Starter
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Brad Cushman
Join Date: Sep 2005
Location: Albuquerque
Posts: 53
Over fed 350

My 67 SS/RS has a '73 vintage 350 cid fed by a Holley 80508-1 750CFM Model 4160 / Weiand 8004 intake manifold. The engine has camelback heads that I don't know anything about yet.

I drive this car in Albuquerque (6000'). I jetted the carb down from 72 to 68 to stop a rich run problem. I was advised to advance the timing to 12 degrees to augment the 68 jet. I am getting clues from this forum that the Holley 750 may be too much carb for this engine and therefore difficult to tune.

I have not tested for vacuum but the brake booster is slow to recoup after the first brake application with the engine at idle. I have also not tested compression yet.

Does anyone have an opinion on this carburetor for this engine?

Brad Cushman
'67 SS/RS
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post #2 of 4 (permalink) Old Oct 12th, 05, 05:40 AM
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Re: Over fed 350

yes I have an almost exact setup but edelbrock intake and my 750 is perfect. idles where I want it and has great throttle response. Kenny
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post #3 of 4 (permalink) Old Oct 12th, 05, 04:59 PM Thread Starter
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Brad Cushman
Join Date: Sep 2005
Location: Albuquerque
Posts: 53
Re: Over fed 350


Thanks, I will pursue the tune of this carburetor by following Holley website clues with respect to idle mixture via vacuum test, float levels and then proceed to timing. Do you have any advice on tuning that you are willing to share with a novice whose setup is similar to yours?

Brad Cushman
'67 SS/RS
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post #4 of 4 (permalink) Old Oct 12th, 05, 05:52 PM
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Join Date: Jan 2005
Location: 2 Dog Town in West Texas
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Re: Over fed 350

I had problems cruising to Clovis, Nm running 72 jets and thats about 4k ft mark. Further south I went , smaller the jet as air is more dense. You may have to do some experimenting or plug reading...

TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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