Larry, What heads are you running? The smaller chambered heads (<72) combined with pistons that are below deck at tdc can be prone to dentation. Has to do with the flame spreading out over the piston in a larger area & creating more heat. zero deck bumps compression but keeps the ignition in the chamber. I have the factory 16 heads, 068 cam, Q-jet & a lowly oe point ignition system with no pre-igntion at all.
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68 GTO 4-spd Convertible
78 S/E Trans am L78, WS6 Auto
78 S/E Trans am W72, WS6 Auto
79 10th aniv W72 Trans am
80 Indy pace car Trans am
89 Trans am GTA
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