Exhaust gasket is made of .030" Multi Layer Steel material which can withstand extreme temperatures and maintains a torque set. Gasket features 2.250" Round Port. Cometic MLS (Multi-Layer Steel)...

Cometic GM LS1 SB 4.035in Bore .040in MLS Head Gasket

GM LS1/LS2/LS3/LS6 Gen-3/4 Small Block V8 .056" MLS Cylinder Head Gasket, 4.190" Bore.

Cometic GM LS1 SB 3.840in Bore .040in MLS Head Gasket