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The question still remains - how are you going to measure it  

 ? I seriously doubt that without some proper measuring equipment (you might want to google that) one would be able to see the difference between 35 and 45 thou. If i remember my 61T block and pistons correctly, the chances of someone getting a nice flat surface on each part (block/piston) to line up properly whilst the piston is actually dead flat... add a bit of oil and there goes a couple of thou..
This isn’t rocket science...
The real way to measure and do so accurately without fancy equipment that mfg's have, is to measure from crank cl to the midpoint of the cams' cl after the head has been toured down... it works like a charm and its not difficult to do.  As an example, Elring says they're gaskets compress to 45-47 range, people who use elring (and have measured) have reported numbers in that range.
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Unless running a competitive engine i seriously doubt that one would be able to tell the difference. Your thoughts?
This couldn’t be further from the truth, tight squish, in a nutshell, improves efficiency in MANY ways, it helps make tuning easier, which makes squeezing more power from the engine easier (that’s tip of the iceberg too). Also, when building an engine why the heck would you not want to make it more efficient (pleasant side effect: more "competitive" if that’s what you're concerned about). 
The whole point is, after many calls to Mitsubishi, I still don’t have an answer for either of the questions I stated at the beginning of this thread, so I thought asking here might be worthwhile.... and it has. (thanks for the info adamrx7 and unior!)