Originally Posted by 01PY0559
Since I own both a 96 GS-R and an 01 ITR here goes
P72 = GS-R
P73 = ITR
As for the valve covers... I purchased from honda the ITR valve cover for my GS-R. Both the patterns are the same. If you can find the VIN on it the first few digits of an ITR are JH4DC231.
Geezus, go look at the head again. It's NOT a P73 stamping. There is NO P73 casting. They are all PR3 casts on 4 different lines, PR3-1, PR3-2, PR3-3 and PR3-4.
GS-R specific parts (including the head) are stamped P72 as you said. As I said, ITR specific parts are stamped P73, but the head is not an ITR specific casting.