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* Lightweight 5-spoke design
* Silhouette Deluxe Solo offers same flowing lines as a Silhouette with a bit more cush for the tush
* Highly conductive helically wound core
* 1/2-13 Plug
* CNC machined finishing on every surface & edge for a smooth feel & better performance
+.040in. Pistons with 8.5:1 Compression Ratio. Fits Big Twin 1941-1979 with 1200cc Engine. BAI-21-0806A * Lightweight 5-spoke designFeatures & Benefits: * Bore = 3. 477" * Stroke = 3. 969" * 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 # 22146 55C * Replaces OEM # 22146 74A Tech Tips: * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers Instructions.