I have only used the internally balanced 4-inch kits from Ohio and I got to tell you it's good stuff. Strong. I have the h beams and I lost an entire cylinder wall on an engine, 'nothing to do with their product' but the rod lumberjacked through it after a piston disintegrated ...but it hung on didn't do anything wrong to the crank and I called them up and they had a replacement Rod ready for me within two grams of the same weight. Had my info on file for bob weight too...great customer service. Great stuff.