Also its my understanding all factory Magnum heads 5.2 and 5.9 had 1.92 intake valves. Now I could be wrong on that but all the ones I have seen are 1.92.
That is what we have been discussing above. There is documentation to support a 1.88 valve in the 5.9, but at the same time, the same guy that wrote the Magnum Performance book (Larry Shepard) is also quotes as saying the 5.2 and 5.9 use the same head. Lot's of confusion. I see a logical progression as to how the documentation could have been messed up, but my theory doesn't fix the issue. So, until magnummopar get's the time to take one apart, it's an "agree to disagree" point.
