Question:
I have a ’73 Duster that I compete in Pro ET with at my local NHRA track. The car currently has a roll bar in it. The car has a back-half installed, but the firewall, floor, and body are all stock. This offseason I plan to build a new engine that should put my car into the low 6 second range in the eighth mile. Will I need to install a complete roll cage?
Duster Dave
Answer:
Duster Dave,
If your car will be running quicker than 6.40 in the eighth mile or 10.00 in the quarter mile you will need a roll cage even though you have an unaltered firewall, floor, and body. Between 10.00 (6.40) and 10.99 (6.99) cars with your configuration are only required to have a roll bar so long as it is not a convertible. Cars without an unaltered firewall, floor, or body running 10.99 (6.99) or quicker or faster than 135 mph must have a complete roll cage.
