1965, 1966, 1967 396 blocks will usually make good power @ .060 to .070 over. 961, 962, and 406 are the last three numbers of these blocks. However, I have recently seen one of these 'thick' blocks split from excessive waterjacket rust. ANY of the other passenger 396 blocks will make more power @ standard bore size and will definitely last longer at this size.
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Arnold Greene
IHRA/NHRA 2420 A/S, B/S
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