Magas, our 4.2 V-6 are different than the 4.6 & 5.4. The dealerships here in Vegas have the same engine as ours. They tell me to do these plenum seals (6 of one # and 1 of another number). Plus there are 8 bolts with grommets on them. This is what is changed not the gaskets between the aluminum intake and heads. Because I couldn't believe no PCV valve as I sated earlier, its up near the IAC and has 2 small 1/4 inch water hoses attached to keep it from freezing up in winter.