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Jim, I don't know much about those type of modded briggs engines, but small industrial based engines typically are governed to 3600 rpm and the fact that the race modded Briggs can hit 7200, to me, means that it is taking a beating compared to what it sees in the normal use it was designed for. With higher compression along with increased fuel/air and the high rpm, you have to figure that the stress on that relatively thin aluminum case is sometimes just too much for it. It probably fatiqued and gave up the ghost at a stress riser emanating from one of those tapped holes in the crankcase. In the cart class I used to race in, blown motors on occasion were part of the price of admission. Maybe a new motor each season is to be expected?
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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Men do not quit playing because they get old.... They get old because they quit playing.
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