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Old 01-21-2005, 08:06 AM's Avatar is offline Moderator
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Good point Johnson; timing wants to be set @ max advance that doesn't ping. The best way I have found for modified engines where factory specs don't apply is to set initial advance using a manifold vacuum gauge. Find the advance at idle (w/ distributor vacuum advance line removed and plugged of course) that give maximum vacuum then back it down about 1 vacuum unit. Road test and advance or retard until you find the sweet spot of max advance w/o ping.
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