Engine Gaskets

Engine Gaskets

Engine gaskets seal the critical oil, coolant, combustion, and exhaust interfaces throughout a vehicle's powertrain, and choosing the correct gasket material and thickness for the specific engine application determines whether a rebuild or repair lasts for 100,000 miles or fails within a season of hard use. Head gaskets, oil pan gaskets, intake manifold gaskets, valve cover gaskets, exhaust manifold gaskets, and supercharger plenum gaskets each face different combinations of pressure, temperature, and chemical exposure that require matched material specifications to seal reliably. High-performance and boosted engines demand gaskets made from multi-layer steel, copper, or specialized elastomeric compounds that maintain sealing integrity at cylinder pressures and temperatures that destroy OEM fiber and graphite gaskets prematurely. Selecting gaskets from Cometic, Fel-Pro, Victor Reinz, or MAHLE ensures the repair or build uses materials engineered for the specific engine family and output level.

Popular Upgrades

Best-selling engine gasket products include Cometic MLS head gaskets for LS, HEMI, Coyote 5.0L, and Evo 4G63 applications that provide multi-layer steel sealing for boosted and high-compression builds, Fel-Pro Performance Plus gasket sets for small block and big block Chevy, Ford, and Mopar engines in complete overhaul configurations, Victor Reinz OEM-quality replacement gasket kits for domestic and import engines requiring factory-specification materials, and MAHLE original equipment-quality gasket sets for German and European engine families including BMW, Mercedes-Benz, and Audi 2.0T FSI and 3.0T applications. Cometic supercharger inlet gaskets and intercooler plate gaskets for Hellcat, Trackhawk, and Whipple supercharged applications are popular maintenance items for high-output blower builds where thermal cycling compresses factory gaskets over time.

Performance and Handling

A Cometic MLS head gasket upgrade on a high-compression or turbocharged engine provides meaningfully better sealing than an OEM composite head gasket because the multi-layer steel design maintains clamping force under the repeated thermal expansion and contraction cycles that compress fiber-based gaskets over time. Head gasket thickness selection directly affects compression ratio, so builders using Cometic's custom thickness program for stroker or oversized-bore engines can dial in the exact static compression ratio target by adjusting the gasket's compressed thickness. Pairing MLS head gaskets with ARP head stud kits ensures the clamping force that maintains the MLS gasket seal is consistent across all cylinder locations and does not relax as a result of the thread yielding that occurs with OEM torque-to-yield head bolt reuse.

What head gasket do I need for a boosted LS?

For a turbocharged or supercharged LS engine, a Cometic C5227-051 or equivalent MLS head gasket in the appropriate bore diameter and 0.051-inch thickness is the standard choice for builds up to approximately 700 horsepower on an otherwise stock-bore LS block. For larger bore LS builds including 4.125-inch or 4.165-inch bore combinations, Cometic's custom bore ordering service provides the correct gasket without the fire ring placement compromise that occurs when using a standard gasket on a non-standard bore. Always pair any head gasket upgrade with fresh ARP 234-4317 or equivalent head studs and a thorough deck surface preparation to achieve the specified surface finish for MLS gasket sealing.

Do I need to replace all gaskets during an engine rebuild?

Yes, replacing all gaskets during an engine rebuild is strongly recommended because the cost of gasket replacement is negligible compared to the labor cost of disassembling the engine again if a gasket that was reused fails shortly after reassembly. Complete gasket sets from Fel-Pro or Victor Reinz include every necessary sealing component for a full overhaul, eliminating the risk of missing a gasket or using an incorrect specification for a secondary application. Saving money on gaskets during a rebuild is one of the most common mistakes that leads to expensive oil or coolant leaks within the first year after the engine is returned to service.

Why These Parts Fit Right

Engine gaskets in this collection are listed by engine family, displacement, bore diameter, and application year to confirm the correct gasket type, material, and thickness before ordering. Cometic custom bore option instructions and Fel-Pro part number fitment data appear on product pages to simplify selection. Fast shipping gets your gaskets on the way quickly, and expert support is available for any gasket specification or compatibility question.

Complete your build with performance hardware from our exhaust collection, improve drivetrain stability with upgrades from our suspension catalog, and maximize airflow with parts from our air intake systems collection.