Sixto -

Probably a stupid question, but trying to run through the scenarios in my mind before I do it.

I am thinking that the only way to be sure the pistons are at their crown (other than #1), is that you turn until you see it dip and then know you have turned to far.

You say not to turn the IP CCW, but I'm thinking that it is going to have to be necessary to turn the engine CCW with the cam sprocket off in order to get each piston at it very top height.

Also, you say measure front to back on the piston, but wouldn't the rod bend so that the measurements would be different left to right rather than front to back? Guess I could take all four measurements.

Is there a tolerance spec for a difference?