heads question
 

In which years do the 4.6 motors have 3 valve heads? Is there a way to tell if the truck has a 3 valve motor or 2 valve motor? Did they ever use both types in the same year?

3v engines arent in the F150's yet for the 4.6 just the exploders have em now but the 07's are epected to have the 3V motor.. and the 3v motors the heads are larger and have magnesium valve covers

Do all the 5.4's have them? if not which ones?

some of the 04's have the 3v heads but all of the 05's have 3v heads

is it possible to put the 3v expedition heads on a 99 4.6? has anyone done it? is it beneficial?

Thanks for the replies!!

Its possible but its alot of work. The main problem is that your current computer cant run the 3v heads, and I dont think just a tune will take care of it.