I think whomever did the bore/hone job knew exactly what he was doing, and did it precisely right. Feeler gauges and spring scales are stone age technology. Your machine shop probably used a dial bore gauge and bored/honed the block to exactly the specifications the piston manufacturer provided. When a dial bore gauge can measure clerarance down to a fraction of a thousandth, repeatedly, with no "fish scale" guesswork, it doesn't get any better than that.


Doing the measurement with a feeler gauge and a spring scale sort of reminds me of the saying, "Measure it with a micrometer, mark it with chalk, and cut it off with an axe!" When the family shop started using a precision power hone instead of a reamer to fit wrist pin bushings and a dial bore gauge to measure clearance back in the early 1950's, our customers accused us of fitting them too loose. The fix was to tap the small end of the rod with a hammer to egg-shape it a little so they would have a bit of difficulty installing the wrist pins. As soon as the engine warmed up a couple of times, the bushing would get round again, and our customers who were too ignorant to appreciate good machine work were happy as a pig in slop!
Jerry

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