which head for the 4.6L?

[stangt00]

Sean Hyland just ports and valves the PI heads, they aren't an "aftermarket" design.

Does it make a difference what head he uses? No! His company sells an aftermarket set of heads. Regardless of what the original piece may be, they are still better flowing PI heads. It is an option to buy vs the FRPP heads at a much lower price. The original question here was what head could he buy to replace his stock NON PI heads. I gave him a cheaper alternative to the pricey FRPP