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#2 |
Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,600
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39 and 40 were basically the same engine except for the ports for the temp senders. 40 used an electric sender so the ports were drilled straight through while the 39 had a ledge in the hole. Many things were changed on these engines over the years. The side shift was introduced for 1940.
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