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This is an 361/391 FT series engine. These are very HD blocks with thick cyl walls. If the stock components are still there it should have a forged steel as well. Cyl bore is 4.05 same as the 390. These engines are getting hard to find as they are well sought after because of there HD nature. The reverse 105 tells what the block is along with the casting number. Take a look at the crank and see if its forged. Let me know what other info your looking for. Nice find. G.
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