Cab, could you get them to supply some paper work on that procedure, please, so I can know if everybody I have ever talked to has done it correctly. A tapper bore cylinder may require may a different procedure, but not every engine has tapered cylinders. Now that I think about it, I know what you'r talking about. We rotate the engine around to compression stroke and listen for the mag impulse to click, then put pressure to the cylinder, then we move the prop back and forth until it doesn't want to move by it's self before putting full pressure in it. Sometimes you have to move it back and forth some to get the valve to seat all the way.