Nice chart Muzza! I picked up mt T500 at a salvage yard and halh the frame #'s had been removed. So I have never known exactly what year it was/is. Well, it's a R model. yep 1970. Thanks. BTW, do you have a favorite year engine? I just purchased a running 73 engine with only 3800 miles on the engine. I plan to use it as a platform for my first race eng. Alex