Cometic C9875-005 Copper Base Gasket 3 3/4" & 3 13/16" Bore .005" Thickness

The Cometic C9875-005 Revolution XL copper base gasket is engineered specifically for Harley-Davidson Evolution Sportster Millennium cylinders with 3 3/4" and 3 13/16" bore sizes. This precision gasket features a .005" (0.005 inch) thickness and utilizes a 4.00" outer diameter spigot, providing exceptional sealing performance for high-performance engine builds.

Key Features:

• Solid copper construction for superior heat dissipation and conformability
• .005" thickness allows precise control of cylinder deck height and piston-to-head squish area
• 4.00" O.D. spigot diameter ensures proper alignment and sealing
• Compatible with both 3 3/4" and 3 13/16" bore Evo Sportster Millennium cylinders
• Ideal for performance engine builds requiring precise compression adjustments
• Made in the USA with premium materials

Copper base gaskets are the preferred choice for performance applications due to their excellent thermal conductivity and ability to conform to machined surfaces. The ultra-thin .005" profile allows engine builders to fine-tune compression ratios and optimize squish band clearances for maximum performance.