cant find a thread stating what head gasket should be used..im thinking a lq4 headgasket should be used since the bore is bigger then the ls1 headgasket or should the headgasket match the combustion chamber?? not 100% sure tho...

 

You never want to use a gasket smaller than the combustion chamber.

 

alright. awesome. so the 6.0 gasket it is then..i think my mind is still caught up on my old 4.8. i was told to run ls1 gaskets with the 243 on the 4.8 so itll match the cumbustion chambers.

 

Ls2? That's kinda what you are making? 6.0 block with 243 head

 

Always match the bore size

 

Always match the bigger of the two. For example, LS3 heads on 6.0; Use LS3 gaskets.

In your case, run the 6.0 gaskets, 12589227.

Keep in mind, 243s were used for LS2s and LS6s....GM used different gaskets only to match the cylinder bore.

 

Hi i'm new in this,i have a swap in my old chevy short bed 90,i already put on this truck. 2001 lq4,schoenfeld longtubes headers,comp cam 595-598 lift-281-283 232-234,92mm tb intake from 2008,60lb fuel injectors,electric fan,3000-3200 stall converter with 4l80e,corvette servo,shift kit,3.73 posi rear end,tuned by khp,275/50/17 rear and 255/50/17 front. I drive everyday like 40 miles.
My cuestion is can i use 243 heads milled to .030,what head gasket i need? Works better or not ? I'll apprecite yours repply. Thankssss

 

Shouldn't have any PTV issues. Just be sure and check pushrod length. You can run any gasket with 4.000"+ gasket bore. You can customize compressed thickness with a Cometic gasket for desired compression or run a factory .051" thick 12589227 GM gasket.

 

I would go with ls3 head gaskets