I was looking at purchasing a set of new 241 heads to put on my LQ4 6.0. Does anybody know what the compression will go up to? The heads are stock, no milling to them at all. I also know that the head gaskets will make a difference as to what thickness. I was looking for a head gasket made for a supercharger application, mp112 with 2.9 pulley, 90mm throttle body, full long tube ceramic coated headers, .228-.236 @.050, .598 lift camshaft. Any help would be great. Thanks

 

u can use gm ls9 head gaskets, or cometic.

 

What will the compression ratio change too?

 

ls9 gasket is 4.1 bore .050 compressed iirc
241 is 67cc chamber
lq4 is .010 out of the hole.
this puts the lq4 right under 10:1 with these gaskets and heads
around 9.9:1

 

Thanks!

 

It would be better to run 6.0 MLS. 4.1 bore is a it too large. You do not want to over do it.