All cars with an OEM frame must have roll bar attached to frame
Cars without frames use 6'' square 1/8'' steel plates on top and bottom of floor, securely bolted together with at least four 3/8'' bolts, or top plate welded to rocker sill.
- NHRA 2006 Rulebook, Section 16, Paragraph 4:10
Last edited by 24-7; Apr 17, 2006 at 05:55 AM.