Sidebar; what do you think of 3d printing a custom camshaft in plastic(compensating for thermal expansion of the metal by a factor of the alloy), adding feeders and troughs to it, submerging in in silica/plaster mix(seen it used before and is cheap), burning out the plastic and filling the cavity with 1 and a half original camshaft material. The end results I've seen for small parts have been pretty good with home level gear these days.