Edelbrock part #9648 Pushrods are designed for Chevy 348/409 "W" series V-8 engine applications. These one-piece pushrods are manufactured from high quality 4130 Chromoly steel tubing that has been surface hardened for maximum durability. They have precise formed wedged ends for a high quality fit with the cup seats. A black oxide finish is added for corrosion resistance. Pushrod Specifications: - For use with Edelbrock hydraulic roller lifters #97423 - Outside Diameter: 3/8" - Length: 8.300"/8.750"