Cometic C10326-063A Cylinder Base Shim .063" Thickness 4.650" ID Milwaukee-8 Pair

The Cometic C10326-063A cylinder base shim is designed for Harley-Davidson Milwaukee-Eight engines requiring precise compression adjustments. This pair of aluminum base shims measures .063 inches in thickness with a 4.650-inch inner diameter, making them ideal for big bore applications and custom compression tuning.

Key Features:

• .063" (63 thousandths) aluminum shim thickness for precise compression control
• 4.650" inner diameter designed for big bore Milwaukee-8 cylinder applications
• High-quality aluminum construction provides excellent heat transfer and durability
• Sold as a pair for both cylinders
• Precision-manufactured to Cometic's exacting tolerances
• Allows fine-tuning of compression ratio and piston-to-head clearance

Cometic base shims are essential components when building or rebuilding performance Milwaukee-Eight engines. These shims install between the cylinder and crankcase to adjust deck height, helping achieve optimal compression ratios and proper piston-to-valve clearance. The .063" thickness provides significant adjustment capability for big bore configurations exceeding the stock 4.0" bore size.