My first 3/3 block cracked on all the way through the RR pivot hole. It was ready to break completely.
My second block, 1.5/3, did the same thing, but was on the side of the LR pivot hole.
I was at my LHS tonight and there was a guy racing with a 210 and his RR ripped completely out of the pivot hole. That was his second block as well.
The material is just too soft. His buggy doesn't have any slop in the suspension. I have slight slop in different places and really don't have any shims that would fill the gaps.