The Cleveland didn't have as good of a bottom end as the 351 Windsor. Its main claim to fame was the great flowing heads. That is why all of the racers used the Windsor with new heads and aftermarket parts as it would stand up better. The Cleveland is a good engine and can be made reliable but here is a quote from a Ford book on engines they made back then. The 351 Windsor with good heads is a strong performance engine and will last. The Cleveland, although being a great engine and having better heads has a claim to fame as the PRETTIEST engine that Ford made. I know people who have had both and in stock for the Windsor outlasted the Cleveland consistently under the same brutal driving conditions. This is NOT a knock on the Cleveland as it can be made into a reliable and very powerful engine.
Ron
