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I don't mean to hijack this thread When Don at FBO set up my distributor, mechanical doesn't start until about 2200 and is all in by 3400. (Of course, with the vacuum advance, it does start advancing at lower rpms).
Question is, why pick one rpm level as your target total over another? What advantage would I have with my total (34*) in by 2500 vs. 3400?

Not a hijack at all, that is a legitimate Q. You want as much advance as it will take wo pinging at any rpm/load/temp and engines can have full adv wo pinging in the 2500 range(or sooner). Those #'s(2200-3400) dont sound right



The dizzy was tagged with the specs and I have verified them (total timing @ rpm). Just don't know why he chose them. (And if you've ever tried to talk to Don, well, you know it's a challenge). Maybe I need to experiment. If it will make for snappier response on the street, I'm for it. Thanks.