Cometic H1518SPF040S MLS Cylinder Head Gasket Bore Thick - LS1 LS2 LS3 LS6 4.085 040

The Cometic H1518SPF040S is a high-performance Multi-Layer Steel (MLS) cylinder head gasket designed for GM Gen III and Gen IV LS small block V8 engines including LS1, LS2, LS3, and LS6 applications. This precision-engineered gasket features a 4.085-inch bore diameter with a compressed thickness of .040 inches, making it ideal for performance builds and compression ratio adjustments.

Multi-Layer Steel Construction:

This gasket features a three-layer design comprised of premium stainless steel. The outer layers are embossed and coated on both sides with Viton, a fluoroelastomer rubber-based material engineered to withstand harsh sealing environments, varying load conditions, and different surface finishes. The Viton coating provides exceptional heat resistance up to 482°F (250°C). The center shim layer is uncoated stainless steel, allowing for precise thickness variations to meet specific compression requirements.

Key Features:

• Three-layer MLS stainless steel construction for superior sealing
• 4.085-inch round bore diameter
• .040-inch compressed thickness
• Viton coating on outer layers for extreme temperature and chemical resistance
• Ideal for aluminum heads to cast iron blocks or aluminum-to-aluminum combinations
• Withstands shearing forces from dissimilar metal expansion rates
• No re-torque required after installation
• Promotes even torque loading to reduce bore distortion

Cometic gaskets are manufactured in their state-of-the-art facility in Concord, Ohio, and are trusted by professional engine builders and performance enthusiasts worldwide. This MLS head gasket provides reliable sealing for street performance, racing, and high-boost applications where precise compression control and durability are essential.