The 351W, or “Windsor” engine, manufactured between 1969 and 2001, is a member of Ford’s 90-degree eight-cylinder engine family. Not to be confused with Ford’s 351 “Cleveland” engine, the 351W gets its name from Ford’s Windsor, Canada, plant, where it was briefly manufactured.
The quickest way to identify a Ford 351 Windsor engine is to count the number of bolts on the valve covers. The valve covers are located on the top of the engine, one on either side of the air cleaner, and each will have six bolts. If the valve cover is removed, you will see “351” stamped on the cylinder head in the valve valley. This method works if the cylinder heads have not been changed with those of a similar engine.