I don't have that particular engine but the valve adjustment procedure is discussed on page 13 & 14 of the PDF manual I attached in my post #17 along with helpful diagrams. I believe it is common to all 4-strokes: you rotate the crank through power stroke until the dwell period where both valves are fully closed. The pushrods should be stationary of course, they are not being acted on by the cam/lifters. They manual indicates there is also a marking on the driver washer to assist with crankshaft positioning. At that point you make the gap adjustment if it falls outside the prescribed limits with the feeler gauge. The firing order of 5 cylinder radials is 1-3-5-2-4