Cometic C5505-066 MLX Cylinder Head Gasket Bore Thick GM - 4.040 066 LS1/LS2/LS3/LS6

The Cometic C5505-066 is a premium Multi-Layer-Xtreme (MLX) cylinder head gasket engineered specifically for GM LS1, LS2, LS3, and LS6 Gen-3/4 Small Block V8 engines. This high-performance gasket features a 4.040-inch bore diameter and a compressed thickness of .066 inches, making it ideal for both street and performance applications.

Advanced MLX Technology:

Cometic's MLX gaskets feature an integrated "stopper" fold-over layer that provides a torque-limiting surface to prevent yielding of the combustion seal. This innovative design delivers optimum combustion chamber sealing and improved clamp load around each cylinder without increasing bore distortion. The 5-layer construction combines multiple embossed layers of stainless steel with proprietary high-temperature coatings that create a micro-seal for fluids against both the head and block surfaces.

Key Specifications:

• Material: MLX (Multi-Layer-Xtreme) stainless steel
• Bore Size: 4.040 inches
• Compressed Thickness: .066 inches
• Number of Layers: 5
• Bore Shape: Round
• Orientation: Non-directional

Performance Benefits:

• Requires less clamp load than conventional gaskets
• Creates less bore distortion for improved cylinder sealing
• No sealants or re-torquing required
• Superior sealing for high-performance and boosted applications
• Conforms to surface irregularities for reliable sealing

Compatible with popular GM vehicles including Chevrolet Camaro (1998-2002, 2010-2015), Corvette (1997-2013), SS (2014-2017), SSR (2005-2006), Trailblazer (2006-2009), Pontiac Firebird (1998-2002), G8 (2009), GTO (2004-2006), and Cadillac CTS (2004-2007). Manufactured in the USA with American-sourced materials.