Cometic C5691-086 MLS Cylinder Head Gasket for Buick V6 Stage I/II 3.860" Bore

The Cometic C5691-086 is a high-performance Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for Buick V6 engines including the 196ci (3.2L), 231ci (3.8L), and 252ci (4.1L) with stock, Stage I, and Stage II cylinder heads. This gasket features a compressed operating thickness of .086 inches and a 3.860-inch bore diameter with valve pockets for optimal clearance.

Advanced MLS Construction:

• Five-layer stainless steel construction for maximum strength and durability
• Embossed layers with Viton (FKM) rubber coating on outer layers for superior sealing
• Heat-resistant to 482°F (250°C) for high-output applications
• PTFE topcoat provides enhanced resistance to fretting and improved cold sealing
• Designed to withstand shearing forces between dissimilar materials

Performance Benefits:

• Provides maximum sealing performance for high-output engines
• No sealants or re-torque required for installation
• Ideal for both aluminum-to-aluminum and aluminum-to-cast iron applications
• Controlled load distribution reduces bore distortion
• Corrosion-resistant with excellent rebound characteristics

Proudly manufactured in the USA with domestically sourced materials, Cometic MLS head gaskets are trusted by professional engine builders and performance enthusiasts for their reliability in demanding conditions. The .086-inch thickness allows for precise compression ratio tuning in boosted and naturally aspirated applications.