*Rules are subject to small changes until March 15th 2025.
NHRA SAFTEY STANDARDS
True Street
Sponsored By Dooley’s Diabolical Diesel
This will be a dial your own style class. You pick a dial for the week and try to run closest to it without going faster. Time slips that are faster than you dial will be counted as a 20 second run. Your dial must be reasonable for your car’s ability. (20 second dial on a 7 second car, for example)
Must Run a DOT tire (street legal slick or radial will be allowed, must have DOT marking on tire). Must have all factory glass. OEM Steel body (composite allowed if OEM, such as the Corvette body). Composite hoods are allowed. Full Interior required. 3000lbs minimum weight Must meet NHRA safety standards for ET.
Stick Shift
Must be clutch assisted shift transmission. Bruno or Lenco transmissions are not allowed.
Power adder car must weigh a minimum of 3000 lbs.
Naturally aspirated cars must weigh a minimum of 2650 lbs.
4 Cylinder cars must weigh a minimum of 2400 lbs.
All cars must meet NHRA safety standards for ET.
Pro Street
OEM Steel body except for hood, bumpers, hood scoop, deck lid, and rear wing/spoiler. Factory open grille, no full block off grilles allowed. Must retain factory wheelbase. Must have stock-appearing dashboard. Must have stock front frame rails. All Lexan windows must have factory trim. 3000lbs minimum weight and must meet NHRA safety standards for ET.
Chassis must have 8.50 cert..
Class ET will be capped at 5.35.
Limited Street
Must be stock appearing. Must have stock style rear suspension. Tire size is limited to 29.5 X 10.5 Non-W slick or smaller, or 315/60-15 radial or smaller.
Class ET will be capped at 6.39 or 135MPH.
Any cars running 7.35 or faster does require: SFI 1.1 or 1.2 Flywheel / Clutch SFI 6.1, 6.2, 6.3 or 9.1 Flywheel shield (for stick shift cars), SFI 3.2A/1 approved jacket, 6 point roll bar, and SFI approved seat belts
Radial Tire
Must be on a radial tire.
Must be stock appearing. Must meet NHRA safety standards for ET.
Outlaw
This is the class to find out who has the fastest car under the Big Sky! All cars must meet NHRA safety standards for ET. Everything else is free game!
Hot Rod
1928-1972 model year vehicles. No tube frame rails. No wings, spoilers, or air dams. 40’s and 50’s style chopping will be allowed. No radical wheelbase modifications.
No Pro-mod style chassis modifications. No front struts.
The engine may not be set back behind stock windshield location.
Vehicle must meet class appearance.
All cars must meet NHRA safety standards for ET.
Gasser
1972 or older model year vehicles. Some exceptions may be made for newer models if they follow the classic Gasser appearance and fit all other class rules.
Must have classic Gasser appearance. (Raised front end)
No bead lock wheels.
If class attendance is below 4 cars you will be grouped into HOTROD
All cars must meet NHRA safety standards for ET.
Naturally Aspirated
NO POWER ADDERS!
This will be separated into small block and big block. Small block being 434 cubic inch or smaller. Big block being 435 cubic inch or bigger.
Must have factory glass, Lexan rear windows in trucks will be allowed for rollbars to go through.
Must have OEM body from the firewall back. No composite doors (unless they are composite from OEM like new corvettes)
Engines must be based upon cylinder-block architecture offered by an OE manufacturer for use in production line passenger cars.
Altered bore spacing is prohibited. Deck height is open.
All cars must meet NHRA safety standards for ET.
Diesel
This class is open to whoever wants to try it. the safety requirements will not be changed. If you do not feel your diesel will not be competitive in this class, you are welcome to enter it into any other class it fits into.
- Competition is only open to diesel powered vehicles.
- All vehicles will be required to have exhausts turned upward away from the track.
- Drive line loop required
No tire size or ET Limitations
Front tie rod strengthening for 4X4 recommended.
All cars must meet NHRA safety standards for ET.
JR Street
NHRA Jr Street Rules. Minors will not be able to drive vehicles outside of the following: staging lanes, track, and return road prior to ET shack.
Jr Street will be limited to 10 cars.
Jr Street racers will pick a dial for the week, any time slip turned in faster than your dial or with a red light will be considered a 30 second run.
Road Week
This is for anyone who wants to join the trip without the stress and work of being in competition.
These cars will not count against the 200-car cap.
Road weeker’s will get VIP parking at each track, Entry into the VIP food tent, and entry into the road week poker run.
Poker Run will be like any other poker run. Cars will get a sealed envelope containing a poker card at each track. Must show check point photos to get the envelope.
At the end of the week the car with the best hand will win a prize.