LS1 LS6 Cylinder Head Gaskets MLS Multi Layer Steel Fits 4.8L 5.

This 2-piece multi-layer steel (MLS) head gasket set (Part #12589226) features a 3.920" bore and 0.051" compressed thickness. It is designed as an OE-style replacement for GM LS1, LS6, and various 4.8L, 5.3L, and 5.7L V8 engines. It is widely used across 2002–2015 Chevrolet, GMC, Cadillac, and Pontiac platforms.