How can you tell 351M from 351W?
How can you tell 351M from 351W? There are several external differences that can help to distinguish between the 351W engine and the 351C and M engines: The 351W has three bolts attaching the valve covers on the exhaust manifold side; the 351C,M has four. The 351W has the timing cover bolted to the block. Where is the casting number on a Ford 351W? Block Identification The 351W casting number is located on the right side of the block, about halfway down, facing downwards. The code will be a combination of letters and numbers -- for example, "E3AE." In this...