Cometic C5256-066 Chevrolet W-Series MLS Cylinder Head Gasket Bore - 348/409 4.375

The Cometic C5256-066 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Chevrolet 348 and 409 cubic inch W-Series big block V8 engines. This precision-manufactured gasket features a 4.375-inch bore diameter and a compressed thickness of .066 inches, providing excellent sealing performance for both stock and modified applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior durability and heat resistance
• 4.375-inch bore diameter optimized for 348/409 W-Series engines
• .066-inch compressed thickness for precise compression control
• Engineered to handle high cylinder pressures in performance applications
• Eliminates the need for retorquing after initial installation
• Compatible with aluminum and cast iron cylinder heads

Cometic's MLS gaskets utilize multiple layers of stainless steel with advanced coating technology to create a gasket that conforms to surface imperfections while maintaining excellent recovery properties. This design ensures a reliable seal even under extreme thermal cycling and combustion pressures, making it ideal for street performance, racing, and engine rebuilds. Each gasket is manufactured to exacting tolerances to ensure proper fit and long-lasting performance.