Can any one guess what he is making?

probably some fixture to be able to set cylinder heads in too for milling guide, seat, valve spring pocket work, etc. Is that going on the series two Bridgeport or the cnc bed mill?
DING DING DING DING. You got it. And yes it will eventually be going on the series II after we make the riser. Common rail Cummins heads are heavy as are Cat and Detroit.Using a pilot level in the guide and adusting it accurately and holding it is critical. The first set in are 6.2 Hemi heads. He uses CBN cutters for surfacing. The finish is like chrome. As nice as my new bumpers.