4.200 MLS Head Gasket .060 - Pontiac 400-455

The 4.200 MLS Head Gasket .060 - Pontiac 400-455 by Cometic Gaskets is a precision-engineered cylinder head gasket designed for high-performance Pontiac V8 engines. This gasket serves as the critical seal between the cylinder head and engine block, preventing coolant and combustion gas leakage while maintaining compression integrity. Whether you're rebuilding a classic Pontiac muscle car or restoring a vintage performance engine, this multi-layer steel gasket is engineered to handle the demands of both stock and modified applications.

Constructed from multi-layer steel (MLS) material, this gasket features a 4.200-inch bore diameter and 0.060-inch compression thickness, specifications that are critical for proper cylinder sealing and head clamping load distribution. The MLS design uses multiple steel layers with elastomer coatings to provide superior durability, thermal stability, and resilience compared to traditional composite gaskets. The 0.060-inch thickness is specifically calibrated for Pontiac 400 and 455 cubic-inch engines, ensuring correct combustion chamber volume and compression ratio when installed with compatible cylinder heads.

Pontiac V8 enthusiasts and engine builders rely on Cometic gaskets for their reputation of quality and reliability across countless restorations and performance builds. This head gasket is ideal for anyone undertaking a complete engine overhaul, cylinder head replacement, or compression upgrade on Pontiac 400 or 455 platforms. Proper installation requires clean, flat mating surfaces and correct head bolt torque specifications; always refer to engine-specific service literature for torque sequences and values to ensure optimal sealing performance and longevity.