Factory machined kit components - I had forgotten that a couple of sets of these were about so will do a build using these in the New Year.
Stuart items, from the Henly-on-Thames era, vastly superior to the unmachined castings currently available.
So this is the fully machined set made and sold by Stuart's in probably the 1950-1960 period.
The assembled big ends and fitted piston rings is as supplied.