Feuling highly recommends using one-piece pushrods instead of adjustable pushrods to maintain maximum cam/valve lift and reduce valvetrain harmonics and associated hydraulic lifter issuesFixed length, 4130 chromoly one-piece pushrods with swedged formed endsHeavy-duty 7/16'' diameter tube with a wall thickness of 0.165''Heat-treated with a black oxide finishStock replacement lengthsDesigned to work with factory base circle camshaft dimensionsWill work with all stock, Screamin' Eagle and Feuling camshaftsMade in the U.S.A.