Valve Clearance on Larger Camshaft and Flat Top Pistons

Another method of measuring the thickness of the clay....
[1] Use a short 3" straight edge, someting like a lathe tool
[2] Somewhere around the middle of the 3", put two marks, 1/2" apart
[3] Position on the flat top of the piston & overhanging the clay; with one mark lining up with the edge of the v/relief, other mark over the clay. From this mark, measure down to the clay.
[4] Remove clay, measure again & you will get the thickness of the clay.