FORD FLATHEAD STROKER KITS: First introduced in 1932, the Ford Flathead was revolutionary and began the American craze with hot rodding. Companies like Edelbrock, Isky Racing Cams, even Speed-O-Motive are where they are today because of their cutting edge innovations with these stout V8 engines. All of our stroker kits are designed for 1939-1953 239cid Flathead motors with 24-stud heads and 2.500" main sizes. Bearings are not included.