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I believe that any head off of a W 4.6L will work from 98 on back. I think that the Romeo 4.6 may have a different timing chain set-up, but the heads should be the same.
Jimmy
99-up heads are the best. They have a PI stamped in them. I believe that the 98-back have 11 bolts in the V/C's and the 99-up (PI heads) have 13/14 bolts in them. That's what the BBK valvecover listing shows.
Jimmy
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.