Cometic C5761-066 MLS Cylinder Head Gasket GM Vortec Gen VII Big Block - 8100 L18 V8

The Cometic C5761-066 is a multi-layer steel (MLS) cylinder head gasket engineered specifically for GM L18 Vortec 8100 Gen-VII big block V8 engines. This high-performance gasket provides superior sealing and durability for demanding applications including heavy-duty trucks, motorhomes, and marine installations.

Key Specifications:

• Bore size: 4.280 inches
• Gasket thickness: .066 inches (compressed)
• Multi-layer steel (MLS) construction for maximum strength and reliability
• Designed for right-hand side (RHS) cylinder head
• Precision-engineered for GM Vortec 8100 (8.1L) Gen-VII big block engines

Cometic's MLS gaskets feature multiple layers of stainless steel with Viton rubber coating, providing exceptional resistance to blowout and superior conformability to imperfect sealing surfaces. The advanced materials and construction make this gasket ideal for both stock and high-performance engine builds, including boosted and naturally aspirated applications. MLS technology ensures consistent clamping load distribution and maintains sealing integrity even under extreme cylinder pressure and temperature cycling.

This gasket is compatible with GM 8.1L Vortec 8100 engines found in 2001-2009 GM heavy-duty trucks and commercial vehicles. Sold individually—two gaskets required per engine.