Re: Timing gear marks don't line up.
The dimple on the timing gear and the pin are a shortcut to finding TDC on #1 cylinder. But if a Model B cover is used on a Model A engine the timing will be off. First principles can be used. If the #1 piston is at the top and both valves are closed then that is where the engine should be timed, with the advance lever all the way up. The points should just be ready to open at that engine position.
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