So I'm using an onlie compression ratio calculator, instead of my math (Wallace racing). What I don't know if when it asks for deck height I make it .000 or if I make it a negative .035, as the pistion is out of the block that much. In calculating the dome volume, the .500 down is 90 cc. But, in reality, the pistion is actually only .465 down even though the dial indicator says it's .500 down. The difference is 11.7:1 or 13.03:1 and if I miss, I will wreck a set of pistons.

Maybe I should old school it and use my math but I thought the computer was easier.

Which way is it?

Thanks