Specifications
- Brand
- Cometic Gasket
- Part #
- C5434-065
- UPC
- 191070126414
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .065in MLS Cylinder Head Gasket - 4.630in Bore
$134.11
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Cometic MLS head gasket for GM Mark IV, Gen V/VI Big Block V8 engines. 4.630in bore, .065in thick. Direct fit.
Key Features
- Fits 1965-1986 Chevrolet and GM vehicles with Mark IV, Gen-V/VI Big Block V8 engines.
- Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
- Viton rubber coating on outer layers provides excellent heat resistance and sealing.
- Compressed thickness is .065 inches with a 4.630 inch bore.
- Designed for aftermarket heads with undersized water ports for custom fitting.
- Suitable for aluminum to aluminum or aluminum to cast iron block combinations.
⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more
Product Details
When you're rebuilding the top end of a big block Chevrolet Mark IV, GM Gen-V/VI engine, getting the cylinder head gasket right is crucial for sealing combustion pressure and coolant. This Multi-Layer Steel (MLS) gasket from Cometic is built for high-output applications, offering a solid seal that doesn't require additional sealants.
Cometic uses multiple layers of stainless steel for strength and corrosion resistance, with a Viton rubber coating on the outer layers. This coating is heat-resistant up to 482°F and handles tough sealing environments. The gasket has a compressed thickness of .065 inches and a bore size of 4.630 inches, designed for aftermarket heads with undersized water ports that allow for customization during installation. This construction makes it suitable for pairings of aluminum heads to aluminum blocks or aluminum heads to cast iron blocks, as it can manage the shearing forces between different metals.
This gasket fits a wide range of vehicles, including models like the Chevrolet Impala, C10 Pickup, and Corvette from the mid-60s through the mid-80s. It's a well-built component for serious engine work.
Specifications
- Brand
- Cometic Gasket
- Manufacturer Part #
- C5434-065
- UPC
- 191070126414
Frequently Asked Questions
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Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .065in MLS Cylinder Head Gasket - 4.630in Bore