My 1965 Z-16 Chevelle motor had been bored out to a 4.25 (plus another .060 for a total bore size of 4.310 and 440 CID). I've heard this was only possible on the thick-walled, 1965 4-bolt main blocks.
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1962 Biscayne O-21669 MKIV/M-22
1962 Bel Air Sport Coupe 409/1,000
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