Cometic C15413-043 Copper Cylinder Head Gasket for Chevy Big Block Mark IV 4.320" Bore

The Cometic C15413-043 is a premium copper cylinder head gasket engineered specifically for Chevrolet Mark IV Big Block V8 engines with a 4.320-inch bore diameter. This gasket features a .043-inch (43 thousandths) compressed thickness, making it ideal for high-performance applications where precise compression control is critical.

Key Features:

• 100% copper construction provides superior thermal conductivity and combustion seal
• 4.320-inch bore diameter designed for Chevy Mark IV Big Block engines
• .043-inch compressed thickness for custom compression ratio tuning
• Embossed design creates multiple sealing points around combustion chamber
• Reusable with proper preparation and annealing
• Excellent conformability to deck surface irregularities

Cometic copper head gaskets are a popular choice for racing and high-performance street applications. The solid copper design excels in high-heat, high-pressure environments and can withstand extreme cylinder pressures. These gaskets require proper surface preparation with an O-ring or receiver groove for optimal sealing. Compatible with BBC 396, 402, 427, 454, and other Mark IV variants with the specified bore size.