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Originally Posted by ChrisBennet

My thoughts are along the lines of 304065's (measurement process).

I measure deck height to flat band around the circumference of the piston face (what I call the "ant racetrack") using a tool I had made. Since the piston can and does tilt in the bore, I measure at 4 places (in line with the pin axis and at right angles to the pin). That gives me the worst case value and an average deck height for the piston.

A possible source of error would be tilt of the cylinder. Are the cylinders held down with 2 cylinder hold down "nuts" each so they are flat?

Each cylinder was held down with 2 hold downs (stomski racing hold downs). Everything was cleaned completely before putting the cylinders in place etc.

Use 6 hold down nuts to hold 3 cylinders down on one side (2 nuts each). Then place a machinists flat edge or piece of ground stock across the top and check for flatness.

As soon as I pick up the straight edge I will do this, great idea.

[/B]i.e. if you measured those pistons again, you would get the same values. If your measurements are inconsistent, you simply can't trust your numbers.

Measuring and re measuring has been something I have been doing slot, initially my technique was not good, however I have honed this to a place I am very confident.

Thanks Chris, I appreciate you taking the time to respond to my questions...