Cometic C4478-045 MLS Cylinder Head Gasket BMW S38B35/S38B36 95mm Bore .045" Thickness

The Cometic C4478-045 is a precision-engineered Multi-Layer Steel (MLS) cylinder head gasket designed specifically for BMW S38B35 and S38B36 engines. This high-performance gasket features a .045" compressed thickness and 95mm bore diameter, making it ideal for both stock rebuilds and performance applications.

Multi-Layer Steel Construction:

• Comprised of 3 layers of stainless steel for superior strength and durability
• Embossed outer layers coated with Viton rubber material on both sides
• Uncoated stainless steel center shim layer for precise thickness control
• Requires no sealants for installation

Advanced Sealing Technology:

• Proprietary high-temperature coating creates a micro seal against head and block surfaces
• Viton coating is heat resistant up to 250°C (482°F)
• Embossments provide superior sealing across various surface finishes and load conditions
• Reduces clamp load requirements and minimizes bore distortion

Key Specifications:

• Material: Multi-Layer Stainless Steel (MLS)
• Compressed Thickness: .045 inch (1.14mm)
• Bore Size: 95mm (3.74 inches)
• Bore Shape: Round
• Number of Layers: 3
• UPC: 191070112905

This gasket is compatible with both aluminum-to-aluminum and aluminum-to-cast iron block configurations, withstanding the shearing forces created by dissimilar materials. It replaces OEM BMW part numbers 11121316705, 11121307529, and 11121401351. The MLS design allows the gasket to rebound under extreme cylinder pressures, making it ideal for high-performance and forced induction applications.

Note: MLS head gaskets require smooth, flat surfaces and cannot be used with engines that have O-rings or receiver grooves around cylinder bores.