By the nature of the engine design, the camshaft at rest will have 2 valves open, 1 inlet and 1 exhaust. and one will be on one of the end cylinders (1 or 4) and the other will be on one of the middle cylinders (2 or 3) so the distance the crank can travel with cam stationary is say from cyl 1 just after tdc to cyl 3 just before tdc, or a few degrees shy of 180 degrees total movement without contact. This will work the same no matter what position the cam stops in, but clockwise or anticlockwise proportions from the start point will vary.
HTH Steve
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