Cometic Chevrolet LS7 Gen-IV SB V8 4.130in Bore .051in MLS Cylinder Head Gasket 1991-gmc-c1500-sierra-slx-esi2073107 750in Drilled Hex Header Bolt

750in Drilled Hex Header Bolt Kit

6AN fittings

It has the mellow Touring sound with no drone inside the vehicle

It has ORB-8 inlet ports and ORB-6 outlet ports

Cometic Chevrolet LS7 Gen-IV SB V8 4.130in Bore .051in MLS Cylinder Head Gasket 1991-gmc-c1500-sierra-slx-esi2073107 750in Drilled Hex Header BoltThe HP shim technology increases clampload around the combustion chamber, thereby increasing the sealability of the head gasket around the open deck block. The embossed outer layers of the gaskets meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes The center or shim layer is an uncoated stainless steel layer which can be varied to accommodate multiple thickness requirements Requires less clamp load