Umm, it has to be something like that. I just pulled mine to put oil in the holes and they all looked good. Is there something that coule have got in the intake and possibly fell into the combustion chamber? Other than that it has to be piston hitting it or a valve.
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!
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