Compare this 351 Windsor block to the 302 seen in the previous photo. Aside from the 351 engine's 1.3-inch taller deck height, the Windsor's most obvious distinguishing characteristic is a diagonal strengthening gusset next to the distributor opening. The short-deck version of the engine doesn't have this. The Windsor block also has 1/2-inch diameter cylinder head bolt holes. Because the Windsor block has a taller deck height, this moves the cylinder heads farther apart, requiring a wider intake manifold to bridge the additional distance between the two cylinder heads. With a slightly trained eye it's possible to recognize a Windsor just by the wider intake manifold.