Okay I found a set of nonmilled (stock cc) perimeter bolt LS1 heads that I would like to use on my 5.3 motor.

The 5.3 is 9.5:1 comp stock w/ ~61cc heads. These heads are ~67cc I want to use. I read that I need a certain headgasket for the older heads for the coolant ports to line up too.

So what is it going to take to use the perimeter bolt heads on my 5.3 motor?

I'd like to keep my compression around 9.5:1-10:1 on the 5.3 motor also. Would I need a thinnner headgasket and to mill the heads to achieve my desired compression ratio? Can the LS1 heads be milled .030-.050 safely?

I am lost when it comes to adapting these heads...

 

the only thing that is different from what i know about the heads is the valve cover bolt patern, not the actual head bolt patern....

 

hit man did you find the info i was telling you about?? i forgot and have not looked. o and like i said befor you might need the coils. cause i remember on my friends car i told you about having the problems on we had to use the older coils. one more thing you might want to check on.

 

i know there is two different head gaskets ,,,if you use the wrong one you will know .....it will pour coolant out everywhere...

 

yes and it sux to learn that with some expensive *** commetic gaskets.