Cometic GM / Mercury 8.1L 496ci 4.350in Bore .066in MLS-5 LH Head Gasket - C5765-066

The Cometic GM / Mercury 8.1L 496ci 4.350in Bore .066in MLS-5 LH Head Gasket - C5765-066 is a precision-engineered head gasket with a 4.350" bore and .350" compressed thickness for the Left-Hand Side (LHS).

The Cometic 5-Layer Multi-Layer Steel (MLS) head gasket is engineered for high-performance and racing applications where OEM gaskets fall short. Featuring 5-Layer Multi-Layer Steel (MLS) construction, this gasket uses five embossed steel layers delivering exceptional clamping load distribution for high-output applications. 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: 5-Layer Multi-Layer Steel (MLS)
• Bore Size: 4.350"
• Thickness: .350" compressed
• Position: Left-Hand Side (LHS)
• Part Number: C5765-066

Verified fitment: Chevrolet Avalanche 2500 (2002–2006); Chevrolet Express 3500 (2001–2002); Chevrolet Silverado 2500 (2001–2007); Chevrolet Silverado 3500 (2001–2007); Chevrolet Suburban 2500 (2001–2006); GMC Savana 3500 (2001–2002); GMC Sierra 2500 (2001–2007); GMC Sierra 3500 (2001–2007); and 1 more.