LS9 heads on gen 4 iron block?
LS9 heads on gen 4 iron block? Will the ARP Head Stud CA625 kit part number 234-4314 work with LS9 heads on a gen 4 iron block? I seem to recall there was something different about LS9 heads from other LS heads?
LS9 heads have 12mm head bolts. So you would have to have the drilled out to accept the larger CA625 units. I've used stock LS9 head gaskets and Katech/ARP head bolts (not studs) and made 1000-1200rwhp for years never losing a head gasket. Mainly 1/2 mile stuff turbo with LS9 block. Just don't get aggressive with timing. LS9 heads are superior because they are rotocast from a better grade aluminum and have additional webbing cast into the rocker arm boss area. They are 2lbs heavier than other production heads each.
I'm selling a set here if you need a set ported/redone by Katech.
I'm selling a set here if you need a set ported/redone by Katech.
