

Specifications
- Brand
- Cometic Gasket
- Part #
- C5666-040
- UPC
- 191070022150

Cometic Ford Big Block 4.40in Bore .040 Compressed Thickness MLS Head Gasket
$98.85
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Cometic Ford Big Block MLS head gasket with a 4.40in bore and .040" compressed thickness. Ensures a strong seal for high-output engines.
Key Features
- This is a Cometic Ford Big Block MLS head gasket with a 4.40 inch bore and 0.040 inch compressed thickness.
- Constructed with multiple layers of stainless steel for increased strength and corrosion resistance.
- Outer layers are coated with Viton, a heat-resistant rubber material, for superior sealing.
- Designed for high-output engines and requires no additional sealants.
- Suitable for use with both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks.
- Fits a wide range of Ford and Lincoln vehicles from 1968 to 1997.
⚠️ 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 a Ford Big Block engine, getting the right seal between your cylinder head and block is crucial, especially with higher-output builds. This Multi-Layer Steel (MLS) head gasket from Cometic is designed to handle those demands. It features multiple layers of stainless steel for increased strength and rebound resistance, helping to prevent leaks even under significant pressure. The outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing environments and various surface finishes, meaning you won't need additional sealants for installation.
This gasket is built to work with both aluminum and cast iron blocks, and it's specifically sized for a 4.40-inch bore with a compressed thickness of 0.040 inches. The layered stainless steel construction not only adds strength but also helps resist corrosion, making it a solid choice for engines that see a lot of use. It fits a wide range of Ford vehicles from the late 60s through the 90s, including models like the Ford F-250 and E-350 Econoline vans, as well as Lincoln Continental.
Specifications
- Brand
- Cometic Gasket
- Manufacturer Part #
- C5666-040
- UPC
- 191070022150
Frequently Asked Questions
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Cometic Ford Big Block 4.40in Bore .040 Compressed Thickness MLS Head Gasket

