How is the manifold? The intake passages and the exhaust passages are cast together on those engines, aren't they?. Could there be a porous spot where fuel is getting in the exhaust side when choked or flooded?
How does it run after its started? Does it idle o.k.?
It could also be a bad exhaust valve seat, which would allow combustion fire into the exhaust manifold.
(I think I heard a story like this once-like 40 years ago- and it involved an AC but cannot confirm it, my Cousin the old time mechanic died.)
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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