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

 

bump, thanks in advance for any help

 

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?

 

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!

 

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

 

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.