The rear case is a fairly straight forward turning job. It has to be cut to finished dimensions before the cylinder flats and case profiling can be done.
The internal cavity has a 4.5 deg back wall, inside and out to support the main bearing. As in the front case the bearing hole is cut .001 undersize for a press fit.
The outside of the rear case has two reference lips cut at 7 in and at 6.680 which will be used during the profiling. There is also a ring at 6 in. to mate with the induction case.