w8ye Let me clear up my post. The Super Tigre offered the sport line and were G-40 and G-49 and aimed at the 40 and 51 true BB engines. No crankcase or much internals interchanged. I am not sure about other sizes offered or if COMO had the same offerings. Como's copied S and GS series ST engines and I know they were going strong in 1988. I don't know if they went further than 1988............Charley you don't have to prove it !!!!!