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I have the 1999 7.4L MPI. The heads are good unless you plan on supercharging the engine. They have a widows peak in the chamber that either needs to be smoothed out or replace the whole head. The reason for this is due to a hot spot that occurs in this area and will cause severe detonation under boost. Some cases these heads dont cause the detonation but If they do your engine is toast. I changed my heads to the earlier design with the peanut ports when I supercharged. Picked up 18 MPH as of last weekend and still dont have the tune just right.
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