Cometic C5434-092 MLS Cylinder Head Gasket Bore Big Block Chevy - 4.630

The Cometic C5434-092 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines with aftermarket heads. This high-performance gasket features a 4.630-inch bore diameter and 0.092-inch compressed thickness, making it ideal for custom builds requiring precise compression control.

Multi-Layer Steel Construction:

• Constructed from 3-5 layers of spring stainless steel for superior strength and corrosion resistance
• Outer layers feature Viton rubber coating bonded to stainless steel, heat resistant to 482°F
• Center layer uses uncoated stainless steel to achieve the desired 0.092-inch thickness
• Embossed layers provide even load distribution across the sealing surface

Performance Features:

• Designed for naturally-aspirated, boosted, and nitrous-fed applications
• Reduces bore distortion and resists corrosive substances
• Excellent rebound characteristics for reliable sealing under extreme conditions
• Compatible with aluminum-to-aluminum and aluminum-to-cast iron block combinations
• Undersized water ports allow for custom water passage fabrication

Installation Notes:

• Specifically designed for Brodix Big Duke and Big Brodie aftermarket cylinder heads
• Install dry—no additional sealant required due to Viton coating
• Not compatible with engines using O-rings or receiver grooves
• Surface finish of 50 RA or finer recommended for optimal sealing

This gasket is sold individually and provides maximum sealing performance for high-output engines where reliability and precision are critical.