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Does anyone know just exactly what and or the difference is between the Lycoming O-290-1 also the same as the O-290-B engines? I think these are military versions, and some of the first produced, says it was certified in 1943 and is a 125 hp engine, I have seen a few of them, I think? They are heavier and have a finned cast aluminum pan, and may also have a different accessory housing similar to the six cylinder O-435 190 hp engine, it may have a better crankshaft, thicker flange, and the cylinders may also be of some value, but probably not? If any one has pictures or engine spec drawings would be appreciated. One for sale locally with a low price and a make offer statement. Dave
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