Cometic C5846-056 MLS Cylinder Head Gasket Pontiac Bore - 400/428/455 V8 4.380

The Cometic C5846-056 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 gasket features a 4.380-inch bore diameter and .056-inch compressed thickness, providing an optimal seal for both stock and performance applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• .056-inch compressed thickness for precise compression control
• 4.380-inch bore diameter designed for Pontiac big-block V8 engines
• Accommodates engine movement and thermal expansion better than composite gaskets
• Resistant to blown head gaskets under high cylinder pressure
• Reusable design with proper surface preparation

Cometic MLS gaskets utilize multiple layers of stainless steel with advanced coating technology to create a superior seal under extreme conditions. The gasket's construction allows it to recover from high cylinder pressures and maintain a consistent seal through repeated heat cycles, making it ideal for performance street engines, race applications, and boosted or high-compression builds.

Application: Pontiac 400, 428, and 455 cubic inch V8 engines. Requires proper surface finish (50 RA or smoother recommended) for optimal sealing.