273 commando Build

I'm starting page and will be posting pics and info building my 273 commando. This engine I'm using is an original engine with 70K miles on it . Has the oem high compression pistons with a standard bore . I will be installing my closed chamber 920 heads, headers , ld340 intake and a custom grind isky T-3 solid cam that was just ordered 455 lift 260 adv duration.
I have a question as this build procedes >>>
What would be the difference in compression if I were to use the oem...

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Author: admin