Again, I still have to disagree. Cap walk isn't what breaks stock blocks. It may, or may not be a contributing factor, but the problem still lies in the thin casting of the block itself. If it were strictly a cap walk issue, a main girdle would essentially solve that problem with the added support they provide. The best a girdle will do is hold the halves together after you eclipse the max power level of the block, so you can hopefully salvage your rotating assembly, when you pony up the money for a good block. You can machine a stock block as much as you want, it still doesn't add material to the main webbing like is done in the aftermarket. A perfectly balanced rotating assembly with perfectly aligned mains is not going to make the block stronger.