[WADS56]

They come in 0, 23, and 50 oz. You bring your damper, and flywheel with the rotating assembly to the machine shop and they ballence it all together. One thing that I don't understand though is than my machine shop said I shouldn't use my stock damper So i just got a summit one that you can adjust the weight, and put it where you want.

The HO 302's came with a 50oz imballence, and i think that 23oz is what they use for the 351's. You can get yours ballenced to 0oz but would cost a couple hundred more because of the extra slugs that they add to your crank. I would do it though.

I wish more then ever that I had mine to 0oz. That is one thing I did not research when I did my motor and now regret it I don't know the exact number or how to figure it out but look at it this way. 50oz hanging about 6" off your crank and spining it to 6500rpm. That adds up to like 200lbs and puting a huge amount of stress on the mains.