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Here is the distinctive 351 Cleveland cylinder head. The squared off exhaust ports with diagonal bolt pattern distinguishes this from a Windsor cylinder head immediately. In this photo it's also possible to discern the multiple valve angles. This splayed valve arrangement is very different that the compact inline arrangement of the Windsor heads. Cleveland cylinder heads have eight valve-cover fasteners compared to the six-bolt pattern of the Windsor. An assembled 351 Cleveland engine has dimensions of 29Lx25 1/2Wx27 1/2H.