Ford’s 3-cylinder diesel heads/valve components had interchange across different displacements and revisions. Parts references show the early C5NN/C5NE components associated with both the 175 CID 3000 family and the larger 4000-series diesel engines. Models I would investigate for C5NN-6050-F interchange. 175 CID diesel family. 201 CID diesel family. WHERE IS AS IS.