Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - what should vacuum be - 350 chevy, 9.3 CR, 236 @ .050
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Old 06-25-2012, 01:35 AM
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Detonation ='s too much timing at max advance.

You cannot just crank in timing. You have to modify the distributor curve to limit the advance travel. 10deg. stock is 20-22deg.

limiting the travel stop to 10deg allows a high idle timing while avoiding excessive WOT max advance. WOT max advance should be 34-36deg .

Further a stock vac advance can will not work.
way too much vac advance, again can cause detonation

Qjet does not use a power valve. Uses a metering rod power piston and spring.
A light tension spring is required.

You have already been told in many previous posts how and why to set up the distributor properly.
But you are not willing to do the work.
Soon you will damage this motor from excessive spark advance @WOT.

This engine will not work on crap gas either.
Find yourself a pro that can tune your car correctly.

This cam is all wrong for the th700r4 OD trans and 3.55 gears and mild converter..

Last edited by F-BIRD'88; 06-25-2012 at 02:03 AM.
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