Ford small blocks 101
Ford produced three different engnes of 351ci displacement. They're known as the "Cleveland", "Modified", and "Winsor" types. All share the same bore spacing, bore size, and stroke length.
The 351W or "Winsor" motor, is named after the Winsor Onterio engine plant, where it was manufactured. This is the only 351 that's "related" to the main small block family, (221, 260, 289, 302). The difference is that the 351W has a taller deck, the distance from the main bearings to the cylinder head mating surface. This makes the 351W taller, wider, and heavier than the 302. This is readily aparant when looking at the intake manifolds from the 351W and 302, side by side.
F.Y.I. The Cleveland motor is also named after the plant where it was created. It's somewhat "beefier" than the 351W, though it shares the lower deck height of the 302. It was intended as a performance motor, and has features like smaller diameter main bearings to reduce friction and larger valves to improve "breathing".
The 351M started out as the 400, a more utilitarian version of the 351C. The 400 has a raised deck, like the 351W, and was used full size cars and smaller trucks, in the early '70s. The 351M is simply a "de-stroked" 400, retianing the taller deck and "workin' class" features of the larger motor.
"Back in the day" the 351C was considered the only 351 for the performance enhusiast. The 351W and 351M were restricted by the designs of their heads.
Now, with aftermarket heads and other bolt-on options available, the "tall deck" 351s are just as attractive for performance applications as the Clevelanad.
Ford produced three different engnes of 351ci displacement. They're known as the "Cleveland", "Modified", and "Winsor" types. All share the same bore spacing, bore size, and stroke length.
The 351W or "Winsor" motor, is named after the Winsor Onterio engine plant, where it was manufactured. This is the only 351 that's "related" to the main small block family, (221, 260, 289, 302). The difference is that the 351W has a taller deck, the distance from the main bearings to the cylinder head mating surface. This makes the 351W taller, wider, and heavier than the 302. This is readily aparant when looking at the intake manifolds from the 351W and 302, side by side.
F.Y.I. The Cleveland motor is also named after the plant where it was created. It's somewhat "beefier" than the 351W, though it shares the lower deck height of the 302. It was intended as a performance motor, and has features like smaller diameter main bearings to reduce friction and larger valves to improve "breathing".
The 351M started out as the 400, a more utilitarian version of the 351C. The 400 has a raised deck, like the 351W, and was used full size cars and smaller trucks, in the early '70s. The 351M is simply a "de-stroked" 400, retianing the taller deck and "workin' class" features of the larger motor.
"Back in the day" the 351C was considered the only 351 for the performance enhusiast. The 351W and 351M were restricted by the designs of their heads.
Now, with aftermarket heads and other bolt-on options available, the "tall deck" 351s are just as attractive for performance applications as the Clevelanad.
