Cometic C5712-086 MLS Cylinder Head Gasket for Pontiac 400/428/455 V8 4.300" Bore

The Cometic C5712-086 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Pontiac 400, 428, and 455 cubic inch V8 engines. This precision-manufactured gasket features a .086" (2.18mm) compressed thickness and a 4.300" bore diameter, making it ideal for stock rebuilds and performance applications.

Key Features:

• Multi-Layer Steel (MLS) construction provides superior sealing and durability under high cylinder pressures
• .086" compressed gasket thickness for precise compression ratio tuning
• 4.300" bore diameter designed for Pontiac 400, 428, and 455 V8 engines
• Embossed stainless steel layers with advanced coatings resist combustion gases and coolant
• Eliminates the need for re-torquing after initial installation
• Suitable for street performance, racing, and engine rebuilding applications

Cometic MLS head gaskets are manufactured with multiple layers of stainless steel, featuring embossments that provide the micro-sealing necessary to keep combustion gases, oil, and coolant in their respective passages. The gasket's design allows it to rebound and maintain seal integrity even as the engine undergoes thermal expansion and contraction cycles during operation.