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* Black Anodize Finish
Designed for smooth operation and long-lasting performance
and FXCWC models)
Enhancement: Improves both visual appeal and riding experience
Deflective Disc Valved Damping self-adjusts to frequency and ensures controlled performance
+.030in. Dome Top Pistons with 8.3:1 Compression Ratio. Fits Big Twin 1978-1984 with 1340cc Shovel Engine. - Keith Black Pistons Shocks * Black Anodize FinishFeatures & Benefits: * Bore = 3. 528" * Stroke = 4. 250" * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter piston to cylinder clearance. * Complete kit includes: two pistons, rings, wrist pins and clips. * Replaces OEM # 21993 80 Tech Tips: * 8. 3: 1 Compression Ratio with 117cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the