Quote:
Originally Posted by tubman
In one of my many former lives, I was a "Corvette Guy". In that world, it was a given that changing a '70's engine (with ported vacuum) back to straight manifold vacuum (which the same engines used in the '60's) yielded a noticeable performance increase. This usually involved a change of vacuum advance "cans" as well.
The General was chasing emissions compliance in those days, not performance.
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The distributor to be used is one from Bubba back when he purchased a quantity of new gm distributors to modify for our flatheads. I understood he set up the weights, springs, vac cans, for our flatheads. I'm aware of his current situation but will try to reach out to him, and Charlie NY who does the same conversion and see what their take on this topic is. Like you, I have a thing for flat top Mallorys and have one of those, also set up by Bubba, but my hope was to take advantage of the vacuum as well as mech advance.