Cometic Pontiac 400/428/455 V8 .030in MLS Cylinder Head Gasket - 4.200in Bore

If you're rebuilding the top end of your Pontiac V8, like a 400, 428, or 455, getting the cylinder head gaskets right is crucial for a solid seal. This Multi-Layer Steel (MLS) gasket from Cometic is designed to handle the demands of these classic engines, ensuring your combustion chambers stay sealed and your engine runs smoothly. It's built to work with both aluminum and cast iron blocks, offering a versatile solution for your rebuild.

What makes these gaskets stand out is their construction. They're made from multiple layers of stainless steel, which gives them increased strength and the ability to rebound, helping them resist corrosion and maintain their seal over time. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C). This combination means the gasket can handle harsh sealing environments and varying surface finishes without needing any extra sealants, making your installation cleaner and more reliable. The center layer is stainless steel and can be varied to achieve the specific compressed thickness you need, which in this case is .030 inches, with a bore size of 4.200 inches.

This gasket fits a range of classic GM vehicles from the late 60s through the late 70s, including models like the Pontiac Firebird, Grand Prix, and LeMans, as well as some Buick and Oldsmobile models from 1975. It's a well-built component for anyone looking to ensure a dependable seal on their Pontiac V8 rebuild.