RC i stand ( sit in my case,) corrected.

I have seen the same engine with the forward facing plug,but didnt know it was a Quadra. Who say's ya cant learn something new! LOL Question for ya though RC, since the 35's were made befor 81,when was the 2.0 produced for the first time? I know mine is a 2.0 because i still have all the documentation on it and it's copy writed for 1981. I originally flew it on a Midwest Giant Sweet-N-Low turning a 20-6/10 cut down to a 19-6/10. Got about 5600 rpm's from her and flew it that way for 15 years! Love the little engine to much to get rid of it,but i do know there are lighter and more powerfull engines out there now.So i don't fly it anymore! Any more info on her will be greatly appreaciated RC.
Thanks in advance
Art