Quote:

..my 340 has L2316 pistons(old style TRW forged)which stick about .022 above the deck.
my deck was squared and my X heads(70 -72 cc) had a clean up cut.
i did the math and i think it was less than 9.5:1


on a 340 unless you cut those j heads down a bunch, if you dont have the pistons sticking .010 to .020 out of the hole your not gonna have 9:1 comp. Even at 10:1 and a decent cam your motor should be fine on pump gas and make plenty of power.