HYD ROLLER CAM Regrinds

I know that the welding works pretty well in Go Kart racing. I know a welding instructor who uses a high manganese TIG rod that makes a harder weld than the base metal. Of course a Briggs flat tappet is a whole different world of spring pressure than a high performance hydraulic roller. Our local machine shop operator showed me a cam design that Isky used to offer with some type of mystery material lobe on the nose that was light grey that he wishes someone would make start producing again. It looked like the Schubeck lifter facing ceramic material.