09-04-2020, 08:44 AM
I do remember seeing this in one of the 750MC books.
Looking at it from a purely practical perspective, I don't think anyone would want the job of machining a bearing bore to the usual +.0000 -.0005" dimension when the top half is Aluminium and the bottom half is cast iron or steel as it would be with the SBG suggestion. Machining a steel cap sitting on a cast iron crankcase or such leaves a lot of work for a rigid hone to get a round hole.
Looking at it from a purely practical perspective, I don't think anyone would want the job of machining a bearing bore to the usual +.0000 -.0005" dimension when the top half is Aluminium and the bottom half is cast iron or steel as it would be with the SBG suggestion. Machining a steel cap sitting on a cast iron crankcase or such leaves a lot of work for a rigid hone to get a round hole.