nysz1b,
Whoever told you about the smokin right cylinder may not have been fully familiar with the GTR engine/crank construction. To clarify :-
The title of this Topic refers to 2 special 57mm seals that BS installed on the outer cheek of the outer crank flywheels, one either side. Theoretically, these 'encouraged' the injected oil to flow towards the big end bearings, whether they were ever effective is debatable. As BS Mechanic states above, they sometimes come loose, break up, and get sucked into the barrel ports !! It does require a full engine strip to remove them but can be done without pressing the crank apart. It's your choice. I'm leaving mine in but will peen the outer edge to improve retention.
The seal that is likely causing the over oiling is set into the R/H disc valve cover, where the crank passes through and stops oil from the primary drive case being sucked into the right cylinder, again as stated above. (The left cylinder is not affected by this issue). My GTO has a similar smoky right cylinder. As far as I can assess this is the only potential source of additional oil to the right Cyl. Although an incorrect fuel mixture or poor combustion may also cause a smoky cylinder. Correctly set up, the 350 oil pump cannot send more oil to one cyl than the other, so can be ignored at this stage.
The labyrinth seal referred to is in the centre of the crank and separates the two cylinders. Of all metal construction, it should never wear unless the adjacent crank bearings fail.
Hope this helps, Brian