Didn't the Buick Grand National GNx have a TC 3800 motor? I have read that it was the quickest production car of its time, even faster than a Vette.Love the sleepers! The 3800 was a potent engine, that's for sure. I had heavily modified my Series II SC 3800 (That's the yellow engine above) and we figure, with the issues I had and on a very basic tune based on the times she was running that she was putting down something like 450 to the wheels. We would have got a lot more out of it had I had the time and money to finish it right.