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1979 Chevrolet Malibu 496-TH400-9" (cruiser). 1992 Chevrolet S10 355-700r4-7.625" (daily driver).
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I'm not too familiar with the Pontiac 400 but the numbers I get for a 6x-4 cylinder head show a pretty large combustion chamber. Flat top pistons with those heads would yield a low compression ratio. Did you happen to measure the combustion chamber?

What are the heads with the 1969 engine?
 
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