Quote: figures vary but compression would be around 8 to 1 maybe lower for a 73 stock 440 unless its considered a hp 440, but i think they were gone by 73 .
HP 440 was still around longer, however HP 440's used the same pistons are regular 440's. So in the 70's a 440HP had the same 7.8 CR as the regular 440's.
