STOCK bottom end LQ9 6.0 (4" bore)
64cc heads
.040 compressed gasket
4.03 gasket bore
piston stroke 3.622
piston deck clearance ??????? i guess .005 above deck????

what am i looking at compression wise? 11.3-11.5ish? thanks gurus. i couldnt find ANYTHING about the piston deck clearance. someone educate me please

 

to get the exact compression you need to cc everything or else you're just guessing

 

cc? im dumb when it comes to this stuff haha. i dont need exact. just close.

 

The calculator I use gave me a 11.1 C.R

 

What I have read about the LQ9 says:
4" bore x 3.622" stroke
factory 317 head is 71.06 cc
Deck is .005" out of the hole
piston volume is 0cc
I think the factory head gaskets are .060"

If it is a stock LQ9 and all you did was swap on some 64 CC heads, you are probably 10.9:1 ish with a stock gasket and a hair under 11.5:1 with a .040" gasket.

I use this handy dandy tool:
http://www.rbracing-rsr.com/compstaticcalc.html

 

your handy dandy tool came out to 11.47. thanks for the link!