With all 16 springs swapped out we then installed the new COMP Hi-Tech hardened chromoly pushrods (PN 7955-16, $135). With a diameter of 5/16 inch and a length of 7.400 inches, they were a simple drop-in deal. Once in place we installed the new Yella Terra roller rocker arms (PN YT-6668, $498). These pieces are lightweight and super strong with cross-shafts for better stability at high rpm. Best of all, they fit under the factory valve covers.