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ah, and a compromise was reached on the wrist pins. Pins are pins, and although one could get picky with the alloy that they're made of, we ended up just doing the obvious: the pistons and rods have been balanced and matched, so there are six sets. So just have bespoke pins milled for each set (we measured the piston holes and the conrod little ends), then the pins, although matched for a particular piston/rod set, will be weight-matched as a whole. Simple enough really.
It's really cool to be working with this guy, and to see how meticulous each step is taken. It's a whole new level of education with engine building.
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