Maintain maximum valve lift! Increase stiffness and column rigidity maximizing valve-train stability, increasing engine RPM horsepower and torque output. Feuling® has engineered these pushrods with 3/8 4130 chrome moly tube and to use a minimal adjustment parameter eliminating flex and loss of valve train-stability problems associated with most adjustable pushrods. Designed to exceed the needs of performance engines using larger lift camshafts and high spring pressures, while maintaining proper and critical oil flow to top end valve gear.