Cometic C4138-056 MLS Cylinder Head Gasket for Cosworth FVA/FVC 87mm Bore .056 Inch

The Cometic C4138-056 is a precision-engineered Multi-Layer Steel (MLS) cylinder head gasket specifically designed for Cosworth FVA and FVC four-valve racing engines. Featuring an 87mm bore diameter and .056 inch compressed thickness, this gasket delivers championship-level sealing performance for high-output motorsports applications.

Multi-Layer Steel Construction:

• Three layers of stainless steel provide exceptional strength, rebound characteristics, and corrosion resistance
• Embossed outer layers with Viton (fluoroelastomer) coating on both sides for superior sealing
• Heat resistant to 482°F (250°C) to withstand extreme combustion temperatures
• Center shim layer allows precise thickness control for optimal compression ratios

Performance Features:

• Load-controlled embossments distribute clamping force evenly across the sealing surface
• Reduces bore distortion and withstands extreme cylinder pressures
• Ideal for aluminum-to-aluminum or aluminum-to-cast iron block/head combinations
• No re-torque required thanks to superior rebound properties
• Pre-coated with sealant—installs dry without additional gasket sealer

Designed for Cosworth FVA/FVC gear-driven four-valve engines, this gasket meets the demanding requirements of Formula racing and high-performance builds. A surface finish of 50 RA (roughness average) or finer is recommended for optimal sealing. Sold individually. Not designed for use with O-rings or receiver grooves.