Cylinder head assembly with valves for the high-output FPT NEF 6.7L engines F4DFE617 and F4DGE617 (Tier 4B / Stage V). Case IH applications: Optum 250, 270 and 300 CVX/CVT. New Holland applications: T7.275, T7.290 and T7.315 (including HD versions). Please confirm your engine serial number / engine part number before ordering. Fit a new head gasket and head bolts when replacing the head.