Made a new drive pulley for the air compressor, it slips over the camshaft balance pulley and is held snug by 8 set screws in the first V-belt grove on the cam pulley. The set screws are slightly off center and have a matching 19* angle so they clamp the new aluminum pulley tight to the front of the old one. Also has a removable cover in the center so the whole assembly can be removed without separating the pulleys.
Because this is a Silver engine I had to use the proper balance pulleys to go with the cross-head pistons, and there is no special pulley with a bolt pattern on front for adding an extra pulley like there is for the normal 4-53T as found in GM trucks. So this was necessary to be able to run the air compressor with the brackets I have. Brackets are available to use the crank pulley, but I needed room up front and the crank drives the AC compressor as it is now.
