||07-27-2014 10:16 PM
The Cleveland is a big block. The Windsor is a small block. There is quite a few differences other than their state of origin. This is a copy and paste from another sight but if you do a quick search the differences are plentiful. If your budget is your limiting factor the Winsor Small block will be cheaper to build. If your looking for max power between the two I believe the Cleveland will be the way to go. A quick summit racing search shows that part like heads, cam, intake, and headers are all plentiful for the 351 Cleveland. I had a 71 Mach 1 with a 351 Cleveland it was an impressive car. I was a big fan of this car and the Windsor and Cleveland were both offered in the 71-73 Mach1. The Windsor was rated at 250HP and the Cleveland was rated at 330HP. Big difference! Notice the difference on the head design below. High flowing heads are where the power is at!
Anyway here are a few differences I quickly found on another sight.
The 351 Cleveland, on the other hand, belongs to Ford's 335 engine family. This thin-wall cast BIG SMALL BLOCK uses the smaller 14mm spark plugs, has a separate front cover (bolted to the block) housing the timing chain and routing water - so that water does not go through the intake manifold, features beefy main caps (wide enough to drill for 4-bolt mains), a poor oiling system, and uses different heads for 2V & 4V versions. The heads make all the difference and these fire breathing babies make this motor the legend it is. On the 4V, the valves are HUGE, measuring 2.19" intake and 1.7n" exhaust (don't remember exactly). Valves this large are only possible via a canted valve arrangement, forming what Ford refers to as a "poly-angle" combustion chamber. The valve covers are not straight - the front is flat and parallel to the ground, but a curve twists the rear parallel to the head. They are attached by 8-bolts and when removed, there is a 4 cast into the corner of the 4V and a 2 cast into the corner of the 2V (at least in 1970). The canted valves are the dead giveaway.
Now a 351 Windsor is really a slightly enlarged 289/302, as it's name implies it comes from Fords "Windsor" engine family (a.k.a. the 90-degree V engine family). The thin-wall cast SMALL BLOCK accepts regular sized spark plugs, uses a timing chain in the block, routes water through the intake manifold, features thin main-bearing caps, a very good oiling system, and uses the same heads for 2V & 4V versions. The heads are small, utilizing in-line valves with relatively small ports. The valves are 1.78" intake and 1.54" exhaust, i.e. the same size as a 289/302. The valve covers are straight (front to rear), attached by 5 bolts, and when removed you can see 351 cast in the lifter valley. The small side-by side (in-line) valves are the dead give-away.