Put 3 bolts into the crankshaft flywheel bolt holes and use a pry bar to turn the engine. Align the timing marks on the cam and crank gears, and the #6 cylinder should be at TDC on the compression stroke. (both valves closed)

It's possible to fit a degree wheel and a dial indicator and actually do a degree check, but I don't think I've ever seen a stovebolt engine out of time with the marks aligned.
Jerry


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