0.0" deck motors. Thats the only way I build them. What this means is that all the burning will take place in the chamber and not in the barrell.This will help the motor run cooler and last longer. It will make more power becuse the air and fuel are controlled and forced into the chamber around the spark and not outside where it will not burn. I use a .04" copper head gasket to have some deck but not the .06 to .10" like some other shops. Now i know that this takes longer and it will cost more money to build but if all auto manufactures are building their motors this way than they must know something!

Take a look at the picture below. Lets say that this is a 1915cc motor that has .08" deck, and 55cc in the chamber. If you are trying to get 8.5:1 compression than most shops will just mill down the heads to lower the cc voluim. Now that will lower the total internal voluim of the combustion chamber but by looking at Piston "A" you will notice that there is a lot of fuel and air that is not buring (GREEN). This is do to it beeing outside of the combustion area. The more you keep the air and fuel inside and around the spark plug the more it can burin. So if your motor gets 100% of fuel and air into the chamber and you only use 65% than that motor will make less power.

What about the heat?
The motor with the extra deck height will have the heat of the compression more exposed to the barrell. Now the barrells are made of castiron and castiron is very good at keeping its structural integrity but its not good at dissipating heat. The head and oil are good at dissipating heat, so the more deck height you run on your motor the more heat you expose to the barrell.
Piston/Chamber "A" has more deck height than Piston/Chamber "B" Now if the total volume in A and B are the same, then why do they look diffrent? Combo "A" has more deck volume and less chamber valume.