GM engineers designed this premium quality pushrod to stand up to the stiffest valve springs. It is made from tough 4130 chrome moly steel tubing with a .080" wall thickness. This superior material significantly increases both strength and stiffness. Loose or misaligned tips are never a problem with this pushrod's one-piece design. Premium quality GM Performance Parts pushrods are case hardened for use with guideplates. Technical Notes: This pushrod is 9.256" long. Use with guideplate P/N 3879620.