Cometic C5712-066 Pontiac MLS Cylinder Head Gasket Bore - 400/428/455 V8 4.300

The Cometic C5712-066 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 4.300-inch bore diameter and .066-inch compressed thickness, providing exceptional sealing and reliability for street and performance applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• .066-inch (1.68mm) compressed gasket thickness
• 4.300-inch bore diameter designed for Pontiac V8 engines
• Embossed stainless steel layers with viton rubber coating
• Excellent resistance to extreme temperatures and combustion pressure
• Provides consistent clamping load across the entire sealing surface
• Ideal for performance builds, turbocharged, and supercharged applications

Cometic MLS head gaskets are the preferred choice of engine builders and performance enthusiasts who demand maximum reliability. The multi-layer design allows the gasket to conform to minor surface imperfections while maintaining superior combustion sealing, making it suitable for both stock rebuilds and high-horsepower racing engines. Compatible with Pontiac 400, 428, and 455 V8 engines including various configurations found in Firebird, Trans Am, GTO, Grand Prix, Bonneville, and Catalina models.