My wife went to vegas! If you ever get the chance to go, check out the HD cafe. They have quite a few bikes in there and some neat ones too, if memory serves there was even a Kmodel chopper! While she was away I machined these cases for 113" cylinders, from 3.750" bore to 4.060" for my latest chopper. I am concerned with the extreme power it is going to make so I welded this hub spacer in. This originally had a cush-driver sprocket, but will be solid mounted now. Holy SHIT! Plus that big inch mill is going to need some air, so a Mikuni flatslide fits the bill. Just be sure your air jet/bleeds arent blocked, you dig?