Originally Posted by Ridin Dirty
But has to be that casting number?
Some '99 4.0s might have used the 0630 head, but all 4.0's from 2000 to 2006 used the 0331 head.
I may end up using an older 0630 head if somebody has one in good shape, but I would have to engineer a way to fasten my coil rail and do some serious exhaust modifications which I was trying to avoid.
A 2002-2006 0331 head would be ideal since they're less prone to cracking (revised casting, supposedly) but I'm not going to be picky as long as its not cracked already.