Is there a reason you can't throw a crank and piston/rod assembly in a bore and check it that way? Pretty much every aftermarket set of pistons has a CD within a .001" and a set of rods made by a good company have about the same C to C distance. Throw the same piston/rod in each corner and you know if the decks are parallel while you are at it.
No special tools, and more accurate than a tape measure and straight edge.
I have a std block and want to bore it .030 over. I'm thinking of going stroker and looking at pistons from dish to flat tops. Some are 2.05 to 2.067 compression height. I'd like to know my deck height so I can figure out which pistons will do what I want to be able to do. I'd like to start out around 10.1 compression but have the option to increase it with a thinner head gasket if/when I want to go faster. Can't stick a .030 over piston in a std bore block.
