9500 Pro-Field Tractor Rules

  1. 640 Cubic inch limit.
  2. 467 cubic inch and above with intercooler will weigh 9000 lbs. with 18 inch hitch height and run 2800 RPM's.
  3. 466 cubic inch and below with or without an intercooler will run 3500 RPM's.
  4. Kill switches are mandatory and must be easily reached by driver while sitting. Air shutoff must be spring-loaded closed.
  5. Tractors must run an unmodified Box Garrett 3x3 GT 4202 or an unmodified GT 4202R single turbo or a smooth bore billet 3x3 turbo. No inner coolers allowed with smooth bore billet turbo. Any tractor 466 cubic and under can run 3,500 RPMs and any tractor over 466 can only run 3,000 RPMs.
  6. Waste gated exhaust housing allowed, but must be altered to look like non-waste gated exhaust housing. All passages internal and external must be plugged.
  7. Must have working tack cable with 1 magnet (female connection from tractor) to hook to sled. CAN NOT tack more than 2800, 3000 or 3,500 RPM per tack box during pull. If the tack box records greater than 2800, 3000 or 3,500 RPM during the pull, that tractor will be disqualified, unless the tack box is determined to be inaccurate. If the tack box is inaccurate, alternate method of checking RPM will be a handheld tack at the end of the track. Flag official at the end of track is responsible for reading the tack box and for determining which tractors to hand check.
  8. The consequence for exceeding the 2800, 3000 or 3,500 RPM limit are as follows: (1) first offense is forfeit prize money and all points (max of 16 points) for that class, (2) second offense is the same as for first offense, and (3) the third offense is 1 year and 1 day suspension for that tractor for all classes in which it competes. The first and second offenses in one weight class do not add to violations in the second class.
  9. P series injection pumps allowed.
  10. No nitrous oxide or propane.
  11. Water and or alcohol injection allowed.
  12. Tire size maximum of 24.5x 32.
  13. Tractor must have side shields covering engine compartment that will contain any fluids or engine parts.
  14. Tractor must have steel flywheel, no cast iron allowed.
  15. Tractors will be equipped with a clutch blanket or steel shield no less than inch thick and 5 inches wide.
  16. Engine must run on factory designed fuel.
  17. 2 springs to pull throttle back to idle; 1 on pump 1 on throttle handle.
  18. Allow 9500 Pro-Field tractors to step up to 8500 Limited Pro Class with no alterations to box charger as long as all other class rules are met. Board will review and modify if needed.
  19. 11,000 hot stock tractors will be allowed to hook in the 9500 pro-field class under one of the following options:
    1. Weigh 9500 lbs. and run under the 9500 Pro-Field rules if, and only if they meet ALL the rules and safety requirements of the 9500 Pro-Field class. (This includes roll cages, steel flywheels, side shields, etc.)
    2. Weigh 11,000 lbs. and run under the 11,000 Hot Stock rules.