I need help guys. I have a 6.0 block I'm topping off with a ls3 top end. The valley cover is the gen III style. They casting number on the back of the block is 12573581. What arp head studs pn do I need. Thanks

 

Are the head bolt holes the same size? If you don't know the way to check is to get a really long screw driver and put it into the outer most holes and mark where the block comes up to. Then check it with the other holes and if they are the same depth you use 04+ style bolts or studs. If they are not the same depth then you use the 03 and below style. If they are the same length then the part number is 234-4317 (this is what I have for my 6.0 block that jas the same length bolt holes)or if they are different lengths the part number is 234-4316 (I believe).

 

Thanks alot... guess I'll do that this tonight after I get off work.