Re: 69 427 motor,57 283 motor,69 small blk heads
block is 3955270 date is nov 69 heads are 3917215 it is a 4 bolt main blk and has hi perf pass or truck cast on the back
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1968 camaro L78
1968 corvette L79
1971 corvette LS6
1973 corvette LS4
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