2004+ LS1 Head Gaskets and Bolt Kit
This Kit includes 2 LS1 Head Gaskets 12498544 and 2004+ head bolts.
LS1 Head Gaskets (best gasket to use on most LS builds)
Prior to 2004, all of the Gen3 and Gen4 GM small block engines had head bolts of varying lengths. In early 2004, GM changed the head bolt design from that style to the new style which are all the shorter length. Please be sure you know which style bolts your vehicle requires before ordering.
HEAD GASKET - LS1 - SOLD IN PAIRS Replaces 12589226
These MLS head gasket that can be used on 4.8, 5.3, and 5.7 liter engines. This is a DIRECT REPLACEMENT for the LS1/LS6 GM head gaskets. This gasket has everything you know and love from the GM version: High quality, MLS construction, and it's produced by the same source as the OEM units!
Bore Size 3.920" Thickness .051"