A FULL ROLL CAGE is required at 9.99 and will get you down to 8.50.
6 and 8 point ROLL BAR is needed from 11.49 to 10.00 flat.
I put a full cage in from the get go. 1 5/8 chrome moly so as to not have to add to a 1 3/4 roll bar and have different size tubing.
Yep, your right, missed that. Kinda confusing the way they say roll bar is good in all cars to 11.00, then say they're ok to 10.00 in full bodied cars. I assume they're saying altereds, rails, etc. are not full bodied cars.
Section 4A, page 5 Super Pro, Pro, Sportsman
ROLL BAR
Roll bar mandatory in all cars (including T-tops) running 11.00
(*7.00) to 11.49 (*7.35), in convertibles running 11.00 (*7.00) to
13.49 (*8.25), and in all dune-buggy-type vehicles running 12.00
(*7.50) seconds and slower. Permitted in all cars. See General
Regulations 4:10, 10:6.ROLL CAGE
Roll cage mandatory in cars running 10.99 (*6.99) or quicker or
any car exceeding 135 mph. In full-bodied cars, with unaltered
firewall, floor, and body (from firewall rearward, wheeltubs
permitted), running between 10.00 (*6.40) and 10.99 (*6.99), roll
bar permitted in place of roll cage. In convertibles running 10.99
or quicker or exceeding 135 mph, roll cage mandatory. Cars
running between 7.50 (*4.50) and 9.99 (*6.39) must have chassis
recertified every three years by NHRA and have a serialized
sticker affixed to cage before participation
