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 issues Fixed length, 4130 chromoly one-piece pushrods with swedged formed ends Heavy-duty 7/16" diameter tube with a wall thickness of 0.165" Heat-treated with a black oxide finish Stock replacement lengths Designed to work with factory base circle camshaft dimensions Will work with all stock, Screamin' Eagle and Feuling camshafts Made in the U.S.A.. PUSHRODS HP+ 17-19 M8