6.4 Head ???

Swifter, who is this "Mopar" source you speak of? Also, this thread seems to have been sidetracked to the Apache head whereas the OP was talking about the 6.4 TRUCK head. Although there's not enough information out on the truck engine, I would imagine the truck engine is a bit different than the 6.4 SRT engine, probably designed in one way or a few ways for more torque that a truck would require...

swifter said

Mopar states you can't use the Apache head on 5.7 block (shroud's valves) they can only be used on a modified 6.1 block with the proper bore size and special piston's with the proper valve notches in them--Please correct me but that is straight from the source---Steve

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