The '70-73 Code M 351C-4V made 300 bhp and 380 lbs./ft or torque stock, the '69 Code M 351W-4V made 290 bhp and 385 lbs./ft of torque stock. The Windsor also weighed 15 pounds less than a Cleveland, both minus alternator, starter, fan, belts, and air cleaner.
The big difference is in the heads of course. 1.85/1.55 valves for the Windsor compared to 2.19/1.71 on the Cleveland.
The reason I beleive Windsors have a little more potential is because of the heads...The only thing really you can do to Cleveland heads to make them better is to get a set of aluminum ones.
But with Windsors having the size of heads they do, you can get a set of aluminum heads with some big valves that will make a lot more difference than aluminum Cleveland heads will. Speaking of which, I've never heard of aluminum heads for Clevelands...is there such a thing? I'm sure there is....
But I know Clevelands are great engines, and Windsors are also, and both have a ton of potential. It's just a matter of preferance...
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