Brett, I think you are correct. I can see the disc when I look in the intake port there. Been a while since I dug this uot so forgot about it. I did find a couple of ST reviews uploaded that talka bout the G60 R and RV engine's. Looks like the frist ones were reviewed in 1965 or 66 maybe. Looking at this G60R review, and seeing the same prop spinner base, I suspect mine may be the G65 R. I'll have to clean it and and all and see what condition it is really in. You can see the disc in the picture on page two. I did add a post in the Carrier section., will see what we turn up!