Stock-height basic engine is direct bolt in replacement for aging 80 H-D Evolution engines. Does not include carb or ignition; use stock or aftermarket carburetor and air cleaner. 508 cam. Forged rocker arms. 585 valve springs. Flat top cast pistons. S&S standard oil pump. S&S performance replacement heads. 3-1/2in. x 4-1/4in. bore and stroke. 8.4:1 compression ratio. Wrinkle black finish. Made in the USa.