moregrip

iTrader: (8)

1. What is the compressed height of a stock GM LQ4/LQ9 Head Gasket? (.054?)
2. What is the gasket bore on a stock GM LQ4/LQ9 Head Gasket?
3. When calculating compression ratio(SCR) what average deck height measurement do you use? (.008?)
4. How many cc's is the dish in a LQ4 piston?(-8cc's?)

thanks in advance

moregrip

iTrader: (8)

bump, thanks in advance for any help

firefighter

Don't know the answers but just something I figured out recently... the compressed height of your head gaskets can REALLY affect compression. Didn't know that till yesterday. Knew it would affect it but a whole point?

Dave88z

Wow, I need the same info for my 6.0L build this winter. Trying to find the best heads/cam package that works on 6L, usually everything is 346!

67Ranger

iTrader: (16)

I'm pretty sure that the compressed height is 0.045. Dont know any of the other things though.

Beast96Z

iTrader: (21)

Your gaskets aren't going to effect compression a whole point. You'd have to have a major variance in thickness before that could take place. As far as the gasket thickness, you'll probablly never get a straight answer. I've seen every thing from .045-.064 for a MLS gasket.