Cometic C5712-030 Pontiac MLS Head Gasket Bore - 400/428/455 V8 4.300 030

The Cometic C5712-030 is a precision-engineered Multi-Layer Steel (MLS) cylinder head gasket designed specifically for Pontiac 400, 428, and 455 cubic inch V8 engines. This high-performance gasket features a 4.300-inch bore diameter and .030-inch compressed thickness, making it ideal for performance rebuilds and street/strip applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• 4.300-inch bore diameter optimized for Pontiac big-block V8 engines
• .030-inch compressed thickness for precise compression ratio tuning
• Stainless steel construction with Viton rubber sealing beads
• Resists corrosion, shearing, and thermal distortion
• Ideal for engines producing up to 1,000+ horsepower
• Reusable design allows for multiple installations when properly maintained

Cometic MLS gaskets are the preferred choice of engine builders and performance enthusiasts worldwide. The multi-layer design provides exceptional combustion sealing while accommodating minor surface imperfections and thermal expansion. Perfect for high-compression builds, forced induction applications, or stock replacement where reliability is critical.

Specifications:

• Material: Multi-Layer Stainless Steel
• Compressed Thickness: .030 inches
• Bore: 4.300 inches
• Application: Pontiac 400/428/455 V8

Sold individually. Two gaskets required per engine. For best results, ensure cylinder head and block surfaces are properly prepared with a minimum 50 RA surface finish.