Not sure how he gets nearly 11.5:1 compression calculation.
Using Diamond's calculator (decent third party data) I get 10.86:1 with .010 deck clearance, a Fel-Pro 1020 gasket and assuming a .010 cut below nominal spec on the deck.
Above also assumes a .250 crevice volume, and the Mahle specified 7cc dome volume.
If - a big if - the block had actually been honed with a torque plate, you would need to have a torque plate installed to properly measure bore diameters.
