I had no idea that rocker shafts were that hard and brittle. That is amazing. What does it feel like if you bolt it down with no pushrods in place? Also, I know on the 216, all the tower bolts have a special shank that locates the support with a very snug fit. It looks to me like it is under a big strain as soon as it is installed. It breaks at the weakest spot, I would think.
