Cometic C5646-040 GM Gen V Small Block MLS Cylinder Head Gasket Bore - LT1/LT4 V8 4.100

The Cometic C5646-040 is a premium Multi-Layer Steel (MLS) cylinder head gasket engineered specifically for GM LT1 and LT4 Generation V small block V8 engines. Featuring a 4.100-inch bore diameter and .040-inch compressed thickness, this gasket provides exceptional sealing performance for both stock and modified applications.

Key Features:

• Multi-Layer Steel (MLS) construction with multiple layers of stainless steel for superior strength and durability
• 4.100-inch bore diameter designed for LT1/LT4 cylinder specifications
• .040-inch compressed thickness for precise compression ratio control
• Stopper layer technology prevents gasket failure around combustion chamber
• Accommodates thermal expansion and cylinder head movement better than composite gaskets
• Viton rubber sealing beads around critical sealing areas for oil and coolant passages
• Reusable in most applications when properly installed and removed

Cometic MLS head gaskets are the choice of professional engine builders and racers worldwide. The advanced MLS design distributes clamping load evenly across the sealing surface while allowing independent movement between layers, making them ideal for high-performance street engines, forced induction applications, and racing builds. Proper surface preparation with a minimum 50 RA surface finish is recommended for optimal sealing performance.