Cometic C5789-040 GM LS Gen-3/4 Small Block V8 MLS Cylinder Head Gasket 4.125" Bore .040" with Darton MID Sleeves

The Cometic C5789-040 is a Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM LS Gen-3/4 small block V8 engines equipped with Darton M.I.D. (Metal Interface Design) sleeves. Featuring a 4.125-inch bore and a 0.040-inch compressed thickness, this gasket is precision-designed to meet the demands of high-performance and competition engine builds.

Key Features:

• Multi-Layer Steel (MLS) Construction: Comprised of three layers of stainless steel, including embossed outer layers with Advanced Multi-Polymer Coating (AMP) and an uncoated stainless steel center shim layer
• Bore Size: 4.125 inches — optimized for Darton M.I.D. sleeve applications
• Compressed Thickness: 0.040 inches
• 3-Layer Design: Load-controlled embossments distribute clamping load evenly across the sealing surface, minimizing bore distortion
• AMP Coating: Advanced Multi-Polymer Coating on outer layers provides superior sealing in high-heat, high-pressure racing environments
• No Sealant Required: Installs dry — adding additional sealants can hinder gasket performance
• No Re-Torque Required: Saves time during installation and break-in
• Round Bore Shape
• Compatible with GM LS1, LS2, LS3, and LS6 Gen-3/4 small block V8 engines

Cometic MLS gaskets are the industry standard for championship-winning teams across professional and amateur motorsports. The center shim layer can accommodate multiple thickness configurations within the C5789 gasket family, making it easy to dial in the correct compression ratio for your specific build. This gasket is sold individually (each).