I put up a post over in the 2nd gen area, but they seem a little busy over there worrying about cab clearance lights and billet cup holders for coffee. I'm trying to find out for sure if all 98. 5-2002 heads interchange with one another? I would ASSUME they do but I am unable to find any sheets saying if those years can interchange with one another..... Please toss up a post if you know for sure... . Thanks in advance