Cometic Engine Top End Kit

Cometic Engine Top End Kits: Race-Proven Sealing for Every Build

When it comes to a top-end rebuild, the quality of your gasket kit can mean the difference between a leak-free, high-performance engine and a costly comeback job. Cometic Gasket has earned its reputation as one of the most trusted names in engine sealing — and their Engine Top End Kits represent the full depth of that expertise in a single, comprehensive package.

Everything You Need, From the Base Up

Cometic's top end kits are engineered to supply every gasket, seal, O-ring, and washer required for a complete top-end rebuild — from the cylinder base upward. Depending on the application, a kit typically includes:

• MLS Cylinder Head Gaskets — the centerpiece of every kit
• Cylinder base gaskets
• Rocker box or valve cover gaskets
• Intake and exhaust manifold gaskets
• Valve stem seals and all relevant O-rings

Cometic EST Top End gasket kits include every gasket, seal, washer, and O-Ring from the base gasket up to the rocker boxes needed for a top-end rebuild. This all-in-one approach eliminates the guesswork and sourcing headaches that come with piecing together gaskets from multiple suppliers.

The Technology Behind the Seal

Two core sealing technologies define Cometic's top-end kit lineup:

• MLS (Multi-Layer Steel): Multi-Layer Steel head gaskets use multiple layers of embossed stainless steel to create a reliable, high-performance seal between the cylinder head and engine block. MLS gaskets provide superior sealing compared to traditional composite gaskets, particularly under the elevated temperatures and pressures of modified engines. The embossed layers create a spring-like sealing effect that maintains consistent clamping force across the gasket surface, even as the engine thermally cycles.
• EST (Extreme Sealing Technology): EST gasket kits include embossed stainless steel head, base, and rocker gaskets covered with a proprietary rubber material. The head gasket material allows heat to be drawn away from the combustion ring and dissipated evenly across the gasket surface to eliminate hot spots and gasket failure.

Proprietary high-temperature coatings along with embossments provide a micro seal for fluids against the head and block surface. For V-twin applications, SPS (Spring Steel) gaskets are made from embossed stainless steel, coated with a high-temperature Viton material that virtually eliminates leakage when joining two metal surfaces.

StreetPro Kits: Race Technology for Every Budget

Cometic Street Pro top-end gasket kits bring race-proven MLS technology to the budget-minded builder. The multi-layer steel gasket reflects their commitment to cutting-edge technology and superior-quality gaskets. Street Pro gasket kits are constructed from multiple layers of stainless steel for strength, along with excellent rebound and corrosion-resistant characteristics. The outer layers are coated with a rubber-based material to create a superior, heat-resistant seal that can withstand extreme cylinder pressures.

StreetPro kits use a mix of Cometic's proven gasket materials — MLS for the critical head gasket, and AFM (Advanced Fiber Material), Aramid Fiber, and Armor Clad for the remaining gaskets — providing the right material for each application in the kit. Coverage spans an enormous range of applications, from classic American V-twins and Harley-Davidson Milwaukee-Eight engines to Japanese sport imports, GM Duramax diesel platforms, and vintage hot-rod V8s.

Why Choose Cometic for Your Top-End Rebuild?

• Cometic gaskets are proudly made in the U.S.A. with materials manufactured on American soil.
• Cometic is one of the most respected names in performance engine gaskets, trusted by professional engine builders, race teams, and enthusiasts worldwide. Their MLS head gaskets are used in championship-winning race engines and high-power street builds across all motorsport disciplines.
• The materials, manufacturing processes, and gasket designs are constantly improving to match the higher level of performance for today's powerful engines.
• Cometic gaskets are ideal for everything from aluminum heads to cast iron or aluminum blocks.