Available in chromoly steel and aluminum. Chromoly pushrods are thinner and have better flex resistancy than aluminum. Aluminum is lighter than chromoly and will reduce inertia mass. But for heavy duty service, like racing and/or high lift cams with high pressure springs it is still advised to run chromoly pushrods. Upgraded replacement for OEM 17904-66 pushrod, adjusting screw and lock nut assembly. Note: See 507200 for aluminum.
Fits: > 66-84 Shovelhead with OEM hydraulic unit (NU)
