Cometic C5434-030 MLS Cylinder Head Gasket Chevy Big Block Bore - for V8 4.630

The Cometic C5434-030 is a precision-engineered Multi-Layer Steel (MLS) cylinder head gasket designed specifically for Chevrolet Mark-IV and GM Gen-V/VI big block V8 engines. This high-performance gasket features a .030" compressed thickness and a 4.630" bore diameter, making it ideal for custom engine builds and performance applications.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability under high cylinder pressures
• .030" compressed gasket thickness provides precise compression ratio tuning
• 4.630" bore diameter accommodates standard and mild overbore applications
• Undersized water ports allow for custom port matching and coolant flow optimization
• Engineered for aftermarket cylinder heads with non-standard port configurations
• Embossed stainless steel layers with Viton rubber coating ensure maximum combustion seal
• Reusable design withstands extreme temperatures and pressures in racing environments

Cometic gaskets are manufactured using advanced laser cutting technology and proprietary materials to meet the demands of professional engine builders and serious enthusiasts. The undersized water ports on this gasket give builders the flexibility to custom-match coolant passages to aftermarket heads, eliminating potential leak paths and optimizing thermal management in high-performance big block Chevrolet engines.