If you are using a mechanical advance distributor, just be sure that the rpm is low enough that the mech. adv. is not adding any advance. Disconnect and plug the vacuum advance like Brian said and you will be fine.
If for some reason you find that there's advance coming in even at a low idle, you will need to add a heavier advance spring to prevent this.
The engine is timed at the 502 HO spec. I am getting 3600 @ 36º with the vacuum disconnected. The dist that I am running gives 22 degrees of mechanical. So 36-22=14 is the initial timing that I have set to. Nowhere can I find any reference of the initial RPM.
You are right, I think the key is to keep the rpm low enough that there is no mechanical advance.
The engine is timed at the 502 HO spec. I am getting 3600 @ 36º with the vacuum disconnected. The dist that I am running gives 22 degrees of mechanical. So 36-22=14 is the initial timing that I have set to. Nowhere can I find any reference of the initial RPM.
Nice ride! My brother in law had a '68 4-speed w/o T-tops about that same color, w/a 400 HP 427. I had basically the same engine in a '69 Impala SS 427 w/TH400 rated @ 390 HP.
I bet that 502 woke it up- what trans do you have?
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