Pontiac Aftermarket Block Cometic 5 Layer MLS Head Gaskets Round Bore- 4.380" Bore- .044" Thick- Butler Spec (Set/2)

Multi-Layer Steel (MLS) head gaskets contain load-controlled embossments which conform load distribution across sealing the area. This creates an exceptional seal by requiring less clamp load resulting in less bore distortion. Gasket Volume +9.9cc (.040" is standard/most common thickness) The stainless steel outer layers are coated with FKM (Viton), a high temperature/chemical resistant polymer. A topcoat of PTFE (Teflon) aids in resistance to fret and increased cold sealing.