I have a 70' Cuda, normally sitting in it and in my former 1968 Dart, I had a maximum of one inch head clearance. The worst part of this car is if I'm wearing a hat with that little button on top, & hit a speed bump, that would make contact with the roof and the hat button would bang the top of my head and be very painful! Then imagine trying to wear a helmet. Not safe for for me. Now my 1972 Charger and 1972 Roadrunner, I have 2. 5 inches of clearance. With the lower race seat I plan to put in, I am hoping to have enough clearance to clear to roof/bars with a full helmet. My problem isn't that just that I'm tall, but my torso is longer that most people. When I sit down, even next to tall people, I am still a full foot higher than anyone sitting in the same seat.