The strongest most durable chromoly pushrod ever produced in the world. Manton Series 5 pushrods are manufactured for the most extreme applications possible. Manton Series 5 pushrods are made from 4130/4135 seamless chromoly tubing using proprietary heat treating techniques to achieve a 275,000 psi tensile strength without becoming brittle. (Note – Shaft or pedestal style rockerarms should be used in conjunction with this series of pushrod because we do not case harden the tube for guide plate use.)