Cometic C5256-051 MLS Cylinder Head Gasket for Chevrolet W-Series Big Block - 348/409

The Cometic C5256-051 is a precision-engineered multi-layer steel (MLS) cylinder head gasket designed specifically for Chevrolet 348 and 409 cubic inch W-Series Big Block V8 engines. This gasket features a 4.375-inch bore diameter and .051-inch compressed thickness, providing optimal sealing for performance and high-compression applications.

Key Features:

• Multi-layer steel (MLS) construction for superior sealing and durability
• 4.375-inch bore diameter accommodates standard and slightly oversized bores
• .051-inch compressed thickness allows for precise compression ratio tuning
• Engineered specifically for Chevrolet 348/409 W-Series Big Block V8 engines
• Handles extreme cylinder pressures in performance and racing applications
• Resists gasket failure from thermal expansion and engine movement

Cometic MLS gaskets are constructed from multiple layers of stainless steel with specialized coatings that maintain seal integrity under extreme temperatures and pressures. The embossed layers provide superior rebound characteristics and conformability to head and block surfaces, making them ideal for high-performance street engines, race engines, and engine rebuilds where reliability is critical.