You will notice that I do not sell what is often called a super case. Any one telling you that you need to weld up or fill behind #3, shuffle pin or makes any type claims of what makes it better just wants your money for nothing. I, personally, have never found any of these items to be beneficial in any way. In fact, they usually cause faster failures. Welding on #3 destroys the material and warps the case so much that they often need to be line bored when still new. What few people realize is that no case fails behind #3 unless it has been subjected to overheating or detonation. This is not the case's fault, it is the owner's fault.
Shuffle pins are another unneeded item. Why not fix the problem rather than put a bandage on your elbow for a sore on your knee. If a quality crankshaft is used that does not bend or flex (shuffle) then the case will not move. In fact, we get many complaints from people having the case break at the center main web after they have installed shuffle pins.
I have never ever had any of these problems with any of our properly manufactured products and combinations, so do not get ripped off by a sales pitch that is designed to have it fail so they can sell you more sooner.