Chet, a friend of mine had his distributor go out last Friday and I towed him in along with his fishing charter clients.
After he replaced the distributor, a lifter went out so he pulled the heads to check the valves and lifter. Sent the heads to the machine shop and had the heads trued, a valve job and a couple of new valves.
Not back together for another charter this weekend, Chet borrowed a friends airboat and this Friday while coming home from fishing with clients, a rod went through the oil pan. Made a hole about 3 X 6" and had oil everywhere. I got to tow him to the dock again. One thing about airboats: If it hasn't happened to you, just wait, it will.