TXsilverado

iTrader: (18)

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

gotjuice?

iTrader: (5)

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

TXsilverado

iTrader: (18)

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

09camaro383

iTrader: (2)

The calculator I use gave me a 11.1 C.R

speedtigger

iTrader: (16)

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

TXsilverado

iTrader: (18)

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