Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .051in MLS Cylinder Head Gasket - 4.450in Bore - LHS - C5766-051

The Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .051in MLS Cylinder Head Gasket - 4.450in Bore - LHS - C5766-051 is a precision-engineered head gasket with a 4.450" bore and .051" compressed thickness for the Left-Hand Side (LHS).

The Cometic Multi-Layer Steel (MLS) head gasket is engineered for high-performance and racing applications where OEM gaskets fall short. Featuring Multi-Layer Steel (MLS) construction, this gasket uses multiple embossed steel layers that conform to surface irregularities and maintain a positive seal. 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: Multi-Layer Steel (MLS)
• Bore Size: 4.450"
• Thickness: .051" compressed
• Position: Left-Hand Side (LHS)
• Part Number: C5766-051

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.