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Hi Harry
The v is a reference spot in the housing to line up with a mark on the fan. I have 2 of these fans-one has 1 mark, which looks like a chisel mark, and the other fan has 2 marks, the chisel mark and a center punch mark about 4 fan blades to the left of the first mark when looking at the front of the fan. I used a bore scope to determint no1 tdc-that turned out to coincide with the punch mark. So-my conclusion is that the chisel line is the 27 degrees before tdc, used for 3500 rpm timing, and the punch is tdc, used for adjusting valves and static timing. Let me know or post here if you learn a different interpretation.
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