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The solder method tells you the clearance between the head and the piston at TDC. It was mistakenly called "deck height" in Waynes book. The deck height is the height of the edge of the piston below the top of the cylinder. It is easiest to measure with a vernier caliper. Measure it at the 3 and 9 positon since the piston will rock in the 6 to 12 axis and affect the measurement.
The deck height should be between 1 and 1.5mm. The way you measured will indicate a greater height because the head has a chamfer around the edge. The solder method will only tell you if you have a safe distance between the top of the piston and the cylinder head, it will not tell you the deck height. You need the deck height for your compression calculations.
-Andy
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72 Carrera RS replica, Spec 911 racer
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