UnBalanced SBM Engine build

I can't quote you any specific numbers, that's what I paid the shops for....lol, but since you're light on the top now, you shouldn't have to buy any heavy metal for the crank. I'm not sure i'd even try it on a driver that saw only 3k, but if you are going into the 6k range, I think it's a must. Not sure what it cost's in your neck of the woods, but a few hundred would be money well spent in my opinion.