The Mustang first offered a 351-cubic-inch small-block V-8 in 1969. Known as the 351 Windsor—for Ford’s Windsor, Ontario, engine plant—it was more than a longer-stroke version of the 302, using a different block and firing order. Offered in two- and four-barrel carburetor versions, the Windsor was a solid performer. However, it was a placeholder in the Mustang while Ford meanwhile finished prepping a more performance-oriented engine family, known by the internal code “335.” This would become the 351 Cleveland, named for where it was produced: Ford Engine Plant Number 2 in Cleveland. Aside from shared bore and stroke dimensions as well as displacement, the 351C was completely different from the 351W. The big story for the Cleveland was breathing. The cylinder heads were essentially plucked from the Boss 302, with minor changes.