Used to ream the pressure relief valve seat of the cam plate in all Twin Cam engines and in the oil pump of M8 engines. Compatible with OEM and aftermarket cam plates. Feuling recommends a new relief valve as Feuling 566110 relief valve; spring & roll pin kit. Note: Can be used with 566117 (Twin Cam cam plate) and 588061 (M8 oil pump) pressure relief valve test tools.
