They are really good ductile iron caps, but I’d rather have the billet caps that Ritter makes for his blocks. Not only are they stronger but they make the block stronger.
Plus, his later blocks using his caps have the register moved to the outside of the cap. So there is no step between the inner and outer bolts.
I forget now and if I think of it I’ll ask Kent about it but somehow moving the register from between the two bolts.