i am trying to figure out what my compression ratio will be. ithe block and head were both decked and .5mm was the amount removed from both combined. the bock was also bored .020 over and is now 83.5mm bore. the pistons i am using are probe forged and the dish is 20cc(or -20cc). the stroke is still the same(91mm i beleive). i also have a 1.7mm mhg and the headgasket bore is 86. but everytime i put these numbers in a calculator they end up something completely wrong so if anyone is good at this that would be great. thanks