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Old 04-26-2010, 12:20 PM
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Excessive end play on the distributor shaft will cause at least some of it. You want to set the play to ~ 0.017"-0.020". I've seen them over 0.100".

Mr Gasket and others have shims for the HEI. The shaft is ~0.490" OD.

What you're probably seeing is a combination of the timing set, distributor end play AND the cam being forced rearward.
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