Clevland vs Windsor!

[MiracleMax]

Yeah if your indicating that they are canted valve heads. They are similar to the cleveland heads, but with a big leap in airflow technology. Probably the greatest difference is in the exhaust port. Anybody remeber those port plates? they basically placed a shelf on the short side radius of the exhaust port on the clevland style head greatly improving exhuast port flow. I dunno what Ford was trying to do with the cleveland engine family? But it definetely wasn't somwthing to do with efficant head design. The 351 cleveland 4v was rated at 300 hp if I remeber correctly and for an engine that sports a seat of heads like the 351 cleveland, one would think that it had the potential to easily produce gobs more power that the factory could have taken advantage of.