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Windsor is 260, 289, 302 and small 351. Cleveland is big 351 and 400. BOSS 302 is a Windsor 302 Block with big 351 Heads.The Top one is what I call the small 351 (Windsor) and the bottom is what I call a big 351 (Cleveland). Notice the size of the Valve Cover and the Thermostat Housing locations.
Yes, all hipo blocks were cast in Cleveland. None were C6AE castings either.