Quote Originally Posted by chevydrivin
I know more about chevy than ford but a guy did show me something on some ford heads. Some have a big hump right inside the exhaust port. he said you can port out that hump to get better flow. it looks pretty easy to port out.

That is true - as long as it is the "right" casting, usually found on the 351 engine. Explorer/Expeditions had a pretty good cast iron head - that I have seen as cheap as $50 a pair. It is the GT40P. There are several good posts here - do a search and you will find more good info then you thought possible