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Are bolt in cages legal for anything like scca racing or anything like that? You can't use any bolts for anything cage related in sanctioned drag racing except for swing outs.
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2008 NHRA Rulebook, General Regulations 4:10 ROLL BARS: All roll bars must be within 6" of the rear, or side, of the driver's head, extend in height at least 3" above the driver's helmet with driver in normal driving position (this is next to impossible in a Galant VR4 BTW) and be at least as wide as the driver's shoulders or within 1" of the driver's door. Roll bar must be adequately supported or cross-braced to prevent forward or lateral collapse. Rear braces must be of the same diameter and wall thickness as the roll bar and intersect the roll bar at a point not more than 5" from the top of the roll bar. Crossbar and rear braces must be welded to main hoop. Side-bar must be included on driver's side and must pass the driver at a point midway between the shoulder and elbow. Swing-out sidebar permitted. All roll bars must have in their construction a cross bar for seat bracing and as the shoulder harness attachment point. Cross bar must be installed no more than 4" below, and not above, the driver's shoulders or to the side bar.
All vehicles with OEM frame must have roll bar welded or bolted to frame; installation of frame connectors on unibody cars does not constitute a frame; therefore it is not necessary to have the roll bar attached to the frame. Unibody cars with stock floor and firewall (wheeltubs permitted) may attach roll bar with 6-inch x 6-inch x 0.125-inch (1/8") steel plates on top and bottom of floor bolted together with at least four 3/8-inch (0.375") diameter bolts and nuts, or weld main hoop to rocker sill area with 0.125-inch (1/8") reinforcing plates, with plates welded completely. All 4130 chromoly tube welding must be done by approved TIG heliarc process; mild steel welding must be done by approved MIG wire feed or approved TIG heliarc process. Welding must be free of slag and porosity. Any grinding of welds prohibited.
Bolt in cage means it is bolted to the car but also means the whole cage is pre welded and can be bolted together so you can install and remove the whole cage with no welding. Which as I already stated is not nhra legal. You can sandwhich bolt the cage mounting plates but the full cage/bar still has to be one solid welded piece. Therefor if you wanted to remove it you could unbolt it from the car but would have to still cut the cage apart to get it out of the car. I forgot about NHRA allowing the mounting plates to be sandwhich bolted together as most people don't do it and it is not as strong as welding to the body. It's an old rule that has been grandfathered throughout the years for people with classic cars who don't want to have to weld 6"x6" steel plates all over their cars and "ruin" it. Most chassis shops will not install cages this way.