Feuling Adjustable Pushrods - Race Series - .120in. Thickness 4070Increased stiffness and column rigidity maximizing valve train stability, increasing engine RPM horsepower and torque output Made from 7 16in. chrome moly steel tube, uses a minimal adjustment parameter eliminating the 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