[WWMCMike]

The 351 Windsor and the 351 Cleveland are completely different other than both use a 3.5" stroke crank and both have a 4.00" cylinder bore. The 351W has a 3.00" main bearing while the 351C has a 2.75" bearing. The 351W has a 9.5" deck height while the 351C has a 9.2" deck height. As stated earlier, the 351W utilizes a bolt on timing cover while the 351C has the timing cover cast into the block and uses a flat cover plate. And of course, the cylinder heads on the Cleveland are a canted valve large runner design, while the Windsor uses an inline valve design with small runners same as used on Small Ford V-8's from the 260, 289, and 351W. Both use the same Ford "4 Bolt per Cylinder" head bolt pattern.

The Boss 302 took a 4 bolt main 302 Windsor block, uses a bolt on timing cover, and adapted the 351 Cleveland style heads. The Boss 351 is an entirely Cleveland based engine.

Hope this helps.

Mike McCullough