In the second of a four-part series on pushrods just released, Engine Pro’s Dave Sutton describes the company’s 4130 premium one-piece pushrod. This performance pushrod is manufactured in the U.S.A from extra thick seamless .083 wall 4130 chrome moly tubing. These pushrods are carbon nitride treated to 60-62 Rockwell “C” scale. The ends are machined to a precise .156 degree radius and sets are matched within +/- .005 overall length.