Just thought I'd post a crappy experience I had in case it helped someone down the road. After a recent rebuild, I had a small oil leak out of my top end. Turned out that the o-ring under the valve cover was just outside the groove at one spot. During disassembly to fix the issue, I cracked all of the valve cover screws loose and then started removing them from the inside out. The o-ring issue was on the outside next to one of the last screws I removed. The pressure of the o-ring pushing up on the valve cover was enough to crack the cover. Totally crappy. But it was just a little corner. Welded back together and hopefully good to go with a new seal. Just a warning to anyone who cares to read. Am I the first this has happened to?
