Cometic Ford SB New Boss 302 4.200in Bore .040in MLX Head Gasket - C15373-040

The Cometic Ford SB New Boss 302 4.200in Bore .040in MLX Head Gasket - C15373-040 is a precision-engineered head gasket with a 4.200" bore and .200" compressed thickness.

The Cometic MLX Multi-Layer Steel (MLS) head gasket is engineered for high-performance and racing applications where OEM gaskets fall short. Featuring MLX Multi-Layer Steel (MLS) construction, this gasket uses multiple embossed steel layers for superior sealing under extreme cylinder pressures and temperatures. Precision CNC-machined to exacting tolerances, this gasket seals combustion, water jackets, and oil passages simultaneously — eliminating the need for multiple gaskets or sealing compounds.

• Material: MLX Multi-Layer Steel (MLS)
• Bore Size: 4.200"
• Thickness: .200" compressed
• Part Number: C15373-040

Verified fitment: Ford Mustang (1969–1971).