Feuling, relief valve plunger, spring & roll pin kit

Fits stock cam support plates. The Feuling spring increases the pressure relief valve pop-off PSI. Note: Feuling recommends bench testing with the Feuling cam support plate pressure test tool, 566117, to set pop-off pressure to your preference and to ensure correct valve seal and valve operation. Note: See 566111 for a replacement relief valve plunger only.

Fits: > 99-17 Twin Cam (NU)