[Ed in Maine]

Finding TDC on #1 sometimes is difficult if the dimple is very shallow. Try this. Take out all the plugs. While you slowly turn the engine with the crank, insert your thumb into #1 and feel for the building pressure indicating that you are on the compression stroke. Before you get to TDC, insert a 1/4 in dowel down into #1 and lean it against the radiator support rod so that you can see the piston approach TDC while turning the engine. When I get to TDC, I mark the dowel adjacent to the radiator support rod for use in the next test. The 1/4 in. dowel will tell you when you get TDC plus a brief interval at the high point and then it goes down. Very easy to see and find TDC. It is the method I use on my Model T. Ed