These 5/16 Pushrods are 7.3" long and are made from 4130 Chrome Moly with .080" wall thickness. They have meticulously formed ends with exact radii, excellent concentricity, closely controlled length, are heat treated, and have a black oxide finish. When using high lift cams and running hi rpm, strength and rigidity are essential for reliability. set of 16 for all SBC and LT engines.