Failure mechanism when I was growing up was cracks between the exhaust valve port and the cylinder and exhaust valve burning. Problems with flat heads is the fact that the exhaust has to go through the engine block to get to the exhaust manifold, unlike an OHV where there is a direct exit point in the head. This is the reason for 2 water pumps and 2 sets of cooling water supply hoses. Back in the day, with lubes available, valve jobs were at 45k miles and full overhauls were at 100k, using things like Havoline 30W HD engine oil.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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