Cometic Pontiac 326/389/421 V8 .060in MLS Cylinder Head Gasket - 4.300in Bore

This is a Cometic Multi-Layer Steel (MLS) cylinder head gasket, specifically made for Pontiac 326, 389, and 421 V8 engines. It's designed with a 4.300-inch bore and is .060 inches undersize, which is important for engine rebuilds where the cylinders might have been bored out slightly. This gasket fits a range of classic Pontiac models from the late 50s and early 60s, including the Bonneville, Catalina, and GTO.

Cometic builds these gaskets using three to five layers of stainless steel. They use stainless steel because it's strong, can spring back into shape well, and resists corrosion. The outer layers have a special embossed pattern and are coated on both sides with Viton rubber. This coating is heat resistant up to 482°F and helps the gasket seal effectively in tough conditions and on various surface finishes, ensuring a solid seal for your engine.