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Can not use a stop bolt with the heads on, but there are other methods that will work with the heads on. You need something you can slide through the sparkplug hole all the way over to the top of the piston. It needs to be something that is thicker than the clearance between the piston and the head and not damage anything but at the same time not be deformed or compressed. A thick zip-tie will work. The method is the same as Mart described. I would add that it is best to check it several times to assure you are getting consistent results. With the heads on it is easy to determine the compression strock by turning the engine over with your thumb over the #1 plug hole. You will feel the compressing.