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Old 01-21-2013, 04:06 PM
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You did not say if it was 1 cyl or all ,if 1 cylinder check for vacumn leak at base gasket or intake ,if more than one check vacumn hose ,or LEAN condition at higher rpm not rich,if it were rich it would be black,but by headers turning red i would go with lean and timing .also check harmonic balancer to make sure is us marked for your application ,some are marked at 12 o clock some at 2 oclock

Last edited by 496CHEVY3100; 01-21-2013 at 04:12 PM.
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