Someone mention ’55 Big Twin? Trying not to get off topic but my ’55 Big Twin has a self tapping screw in the #1 position in Richards photo. While rebuilding the motor a few years ago, I asked about it on the Green Boards and a very knowledgeable member had the answer taken from a service bulletin. All I can remember is the screw was there for a reason so back in it went. There is no plug in the #2 position either or a baffle plate below the powerhead. What he did explain was it had to do with what letters were stamped on top of the block back at the factory. Mine has ‘AE’ stamped on it so it fell into the category requiring the screw. I’m guessing there are at least two different versions of the blocks even though they are from the same year. I sure wish I had saved that thread now.
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