To my knowledge, formula cars through 1977 were not required to have a dash hoop matching the main roll bar size and wall thickness. Around 1977, I think SCCA required all cars to have matching roll bar/dash hoops in size/thickness. A lot of pre-1976 cars were updated as they were still current competitive race cars and I think may have been forced to have it to pass tech but not sure?
Did you have to update your car if you had a 1976 or older car OR was the update just for new cars getting SCCA log books from 1977 onward?
Did this rule stay the same all the way up through modern time in regard to SCCA? Can someone give a historical timeline of this change from 1977 through modern day?
All of this applies to North America,not just SCCA... so what were Canadian rules, Midwest Council rules, etc.
Thank You
Mike Winebrenner