I don't know a lot about outdrives. My Bravo XZ siezed Mon. at Havasu. The top cap with the four bolts exploded. The bolts are still there, but the center blew out. The engine (Merc 500HP) died instantly. The 2hr. tow back to site 6 had a trail of gear oil the whole way. Any ideas what the hell happened? I was trimmed properly. I was doing about 65mph.