Quote:
Originally Posted by lust4speed
Correct me if I'm wrong, but in '67 the only Pontiac engine with dished pistons was the "Export" engine, and all others had flat tops. If so, bolting on a set of 670's is going to raise the compression ratio too high. Sounds like a miserable swap to me unless you go with new dished pistons.
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Correct.
By that time the factory only used dished pistons on the 428 to maintain the same compression as 400 engines using the same heads.
Otherwise no dished pistons since the late ‘50s early ‘60s export engines with 7.6:1 compression.