Cometic Pontiac 400/428/455 V8 .030in MLS Cylinder 4.160in Bore

The outer layers of this Cometic head gasket are coated with Viton, a heat-resistant rubber material rated up to 482 F. This gasket is built for Pontiac 400, 428, and 455 V8 engines, featuring a 4.160-inch bore and a compressed thickness of 0.027 inches. It's designed to handle the demands of high-output engines and works well with both aluminum and cast iron blocks.

Cometic's Multi-Layer Steel (MLS) construction uses multiple layers of stainless steel for increased strength and resistance to corrosion. This design helps prevent shearing forces between different block and head materials, like aluminum heads on cast iron blocks. The embossed outer layers with Viton coating ensure a strong seal without needing additional sealants, making it a solid choice for rebuilding or upgrading your Pontiac V8's top end.

This gasket fits a range of classic Pontiac models, including the Bonneville, Catalina, Firebird, and Grand Prix from the late 60s through the late 70s. Always refer to the manufacturer's installation instructions for proper torque sequences and any specific preparation steps.