Cometic C9939 Copper Base Gasket Builder's Kit EVO Sportster 3-13/16" Bore

The Cometic C9939 is a premium copper base gasket builder's kit designed specifically for Harley-Davidson Evolution Sportster engines with 3-13/16" (97mm) cylinder bore. This professional-grade kit provides engine builders with multiple copper base gasket thicknesses, allowing precise adjustment of cylinder deck height to optimize piston-to-head squish area for maximum performance.

Key Features:

• Multiple copper base gasket thicknesses included for precise deck height adjustment
• Premium solid copper construction provides superior sealing and heat transfer
• 3-13/16" bore size fits Evolution Sportster engines
• Ideal for performance engine builds requiring custom compression tuning
• Allows builders to dial in optimal squish clearance for efficient combustion
• High-quality materials ensure leak-free operation under high-performance conditions

This builder's kit is essential for professional engine builders and performance enthusiasts who demand precise control over compression ratios and squish band geometry. The multiple thickness options allow builders to adjust cylinder deck height for precise piston-to-head squish area, simplifying set-up when building performance engines. Copper gaskets offer excellent conformability and heat dissipation properties, making them ideal for high-compression and high-performance applications.