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Old April 12th, 2006, 09:27 PM   #14
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what everyone else said...
timing is too high for the compression ratio you are running. Im at 9.?:1 small cam and flattops in my 400. 10 degree's initial and the motor will ping without 93 octane.
You can bush cleveland pistons to get different comp ratio's since there werent many made for modifieds. has alot of 400 info.
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