Cometic C5645-027 GM MLS Cylinder Head Gasket Bore - LT1/LT4 Gen-2 4.040

The Cometic C5645-027 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM LT1 and LT4 Generation 2 small block V8 engines. This precision-manufactured gasket features a 4.040-inch bore diameter and a compressed thickness of .027 inches, making it ideal for performance builds and engine rebuilds requiring reliable sealing under high compression and extreme temperatures.

Key Features:

• Multi-Layer Steel (MLS) construction for superior sealing and durability
• 4.040-inch bore diameter accommodates standard and mildly overbored applications
• .027-inch compressed thickness for precise compression ratio tuning
• Engineered specifically for GM LT1/LT4 Gen-2 small block V8 engines
• Advanced embossment technology ensures even load distribution
• Resists blowout and maintains seal integrity under extreme cylinder pressures
• Suitable for high-performance street and racing applications

Cometic Gaskets are manufactured using state-of-the-art materials and processes to deliver race-proven reliability. The MLS design provides excellent recovery characteristics and conformability to imperfect sealing surfaces, making this gasket an excellent choice for builders who demand maximum performance and longevity from their Gen-2 LT engine builds.