Huge power increase over stock engine. 124 cubic inch displacement. 4-1/8" bore. 4-5/8" stroke. 640 cam.. 1.671" diameter crankpin. .927" wristpin. Piston cooling jets. S&S forged pistons. 10.8:1 compression. S&S 3-piece flywheels. HVHP oil pump. S&S electric compression releases. S&S Super G carburetor. S&S Slasher air cleaner. S&S Superstock ignition. Fits 84-99 H-D Big Twin Chassis. Made in USA. Wrinkle Black
