460FI engines were offered in F250 trucks from 1988 through the end of production. I don't know a great deal about them but can offer the following:
There seems to be two slightly differing versions, those being 1988-1992 version and the 1993 & up version.
1993 & up
- Slightly dished pistons
- E7TE head with a small 2.00" intake valve
- Notably dished pistons
- F3TE head with the standard 460 2.09" intake valve
The smaller valve in the E7TE heads leaves a bit to be desired in the power department, but proper porting and installation of the regular size intake valve (or bigger) can help substantially. Of course, the same is true with the F3TE casting (porting). Some people like to use the shallow dished 88-92 pistons with the later (and slightly smaller combustion chamber) F3TE castings so as to raise compression.
All the fuelie 460's use hypereutectic pistons and have a "straight-up" roller style timing chain.