Chrissy - Jay's got 2 problems here, the pistons touch the head before TDC and the CR is way too high as the pistons are flat and come to the top of the block (i fact slightly higher than standard evidently) To get CR 8.2:1 there needs to be 13.5cc capacity below the block level at TDC - ideally as a bowl in the piston. In the event the pistons are machined flat, they need to be more than 2mm below the deck height to get that extra volume to get 8.2:1 CR..

James - the more i think about it, the more i feel those pistons haven't actually been machined! They should really be machined with a bowl (like Chrissy's picture) and make sure the outer raised ring clears the head at TDC obviously.. This will give much better combustion characteristics than a flat top.
No real way of telling i guess without taking it apart and measuring piston height... Presumably there are no markings on top of the crowns, whick would indicate they are unmachined??

Rich