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C.J.
You're making me think know. No I did'nt recently change the intake
manifold and I you are obviously right about the seal to the block having nothing to do with vacuum. What I did change was the spot where I pulled vacuum for the power brake booster. Remember I originally had an edelbrock and pulled the brake from the rear of the carb. When I switched to the QJet I had to pull vacuum from a plug on the front of the manifold instead. Now I'm back to an edelbrock but plucked the back of the carb instead of returning the brake hose to it. Perhaps under load vacuum is reduced to a point where there is not enough for the vacuum advance? what's your take?
Thanks for thinking with me. John
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