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dist. advance set-up

1925 Views 9 Replies 5 Participants Last post by  tremec
I bought a MSD dist kit and it has full adjustment for the advance curve.
What RPM does the advance need to begin and how much total ? I think the limit is 28* mechanical . It starts easily w/ 12*initial.
10.5 to 1 w/781 heads,427 with 279*/290* Crane cam , QJ on alum intake -maybe 3310 Holley later, Hedmans ,3.31 rears.mostly street cruiser.
I will add a 6AL box with the dist. install also.
All new and haven't got enough miles to put it thru the paces yet with the original point dist
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Dist. is part of a ready-to-dist. kit...has reluctor wheel like HEI . Current QJ only has a manifold vacuum port. Venturi vacuum makes more sense to me, to increase timing with throttle opening. Not with the car presently but will check vacuum and get back later
You don't want that. With additional throttle opening you get more cylinder filling (resulting in higher cylinder pressure). Higher pressures burn faster, requiring less, not more, ignition advance. Listen to the guys recommending manifold vacuum advance. They know what they're talking about.
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