Cometic C4146-140 BMC A-Series MLS Cylinder Head Gasket Bore - 1275 73mm 140 Inch

The Cometic C4146-140 is a premium multi-layer steel (MLS) cylinder head gasket engineered specifically for BMC 1275 A-Series engines, commonly found in classic Austin Mini Cooper models from 1964-1969 and other British Motor Corporation vehicles. This high-performance gasket features a .140 inch (3.56mm) compressed thickness with a precision 73mm bore diameter, making it ideal for both street and performance applications.

Advanced MLS Construction:

• Five-layer stainless steel design for maximum strength and durability
• Outer layers embossed and coated with Viton (FKM) fluoroelastomer rubber, heat resistant to 482°F (250°C)
• Uncoated stainless steel center shim layers provide precise thickness control
• Superior resistance to corrosion with excellent rebound characteristics
• No gasket sealers or re-torque required

Key Specifications:

• Material: Multi-Layer Stainless Steel (MLS)
• Compressed Thickness: .140 inch (3.56mm)
• Bore Size: 73mm (2.874 inches)
• Number of Layers: 5
• Bore Shape: Round
• UPC: 191070101497

Cometic MLS gaskets excel at sealing aluminum-to-aluminum and aluminum-to-cast iron engine combinations, effectively handling the different thermal expansion rates between dissimilar materials. The load-controlled embossments distribute clamping pressure evenly across the sealing surface, creating an exceptional seal while minimizing bore distortion. Recommended surface finish is 50 microinches RA or finer for optimal sealing performance.

Proudly manufactured in the USA with American-sourced materials, Cometic gaskets are trusted by professional engine builders and racing teams worldwide for their precision engineering and consistent reliability in high-performance applications.