I think I read on this site somewhere that the 2.3 has a balance shaft. but the 2.0 does not. When you say internally balanced, do you mean like what you do when you "blueprint" an engine or are you referring the the balance shaft that is added to reduce vibration?[screwy] internally balanced? or? my question is- whats the big deal about changing the stock crank pulley off with built in harmonic balancer-with a billet aluminum one? harmonic balancer that important?