+.010in. Pistons with 8.5:1 Compression Ratio. Fits Big Twin 1941-1979 with 1200cc Engine. - Keith Black Pistons Crankcase & Bottom End - Sporty * You can make the

* You can make the rack detachable by adding a custom thumbscrew

This fitment for the Raptor Pull Back Plate is designed for 2018 and up Softails

* Will not fit the Bobber or Bobber Twenty

Performs as good or better than stock

* 15 frictions

+.010in. Pistons with 8.5:1 Compression Ratio. Fits Big Twin 1941-1979 with 1200cc Engine. - Keith Black Pistons Crankcase & Bottom End - Sporty * You can make theFeatures & Benefits: * Bore=3. 447 * 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 # 22143 55 * Replaces OEM # 22143 74 Tech Tips: * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers Instructions. *