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Interesting. I didn't notice that the motor wasn't fresh out of the shop.
I don't know if this is really a good idea, but here goes:
Instead of pulling the engine apart to measure the piston dish and the chamber volume on the head, you could get yourself a powerful flashlight, syringe with clear volume markings, 100ml's or so of gasoline, and some food coloring.
Put cylinder #1 at TDC, pull the spark plug, and 10ml's at a time fill the combustion chamber with the mixture of gasoline and food coloring. The food coloring would just make it easier to see the liquid, well... might.... may not be neccessary. Once your 10ml steps bring the fluid up above the plug threading on the head you should be able to carefully suction the excess out and note the volume to tally up your chamber volume.
Once you know the chamber volume you can add that to the cylinder volume (1587cc if you have an 81mm bore, 1607cc if you're .5mm over stock, which I assume you are since your motor is built) to get the total volume. Then just take that number and divide it by the chamber volume to determine what your compression ratio is.
Of course this will only work if you have a good ring seal to the cylinder wall - I assume you will since the motor is practically new. Keep in mind this is purely my theorizing and I haven't personally tried this method.
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