Hidden Valley MotorSports Park Mud Bog
“Pit” Classes
Note: Classes designated “Pit” will run in relatively deep mud. Drivers entering “Pit” classes should be prepared for the possibility of getting stuck!
1 - Tire height will be determined by sidewall stamp.
2 - One class penalty for removing stamp (exception made where modified
tires are allowed).
3 - Tires with sizes not noted in inches will be measured horizontally.
4 - In classes allowing tire modifications, tire height will be determined by
Measurement (horizontally).
Classes listed below will not be run in this order. Check individual event information links to see in what order the classes will run. Some events will not utilize all classes:
(A) REAL STREET “PIT”
1. Tires limited to unmodified or D.O.T. approved of 35.0” or less in diameter.
2. No agricultural/industrial tires.
3. Dual wheels allowed only on vehicles so equipped from the factory.
4. Body, Frame, & Suspension must be in an O.E.M. combination.
5. Stock replacement lift kits allowed.
6. Engine and all drive train components must be in stock location.
7. Heavier drive train components may be used.
8. Must have full internal and external body with front bumper. No gutting of bed or cab.
9. Fiberglass replacement body parts must retain O.E.M. dimensions.
10. May remove doors from CJ, YJ, TJ, FJ40, Scout, pre ’78 Bronco, & similar.
11. Tops may be removed from vehicles with removable tops. May remove tailgates.
12. Must retain seating for at least 2 passengers and all permanent glass.
13. Vehicle must be street legal with current registration and all necessary equipment.
14. 4, 6, 8, & 10 cylinder automotive engines only. Any 4 or 6 - cylinder swap allowed.
15. Maximum exhaust size: 3” all vehicles running dual exhaust, 4” for single.
16. Must have mufflers, which exceed exhaust diameter by at least 1” and will have a minimum body length of 8”. Exhaust must extend behind driver’s seat.
17. No aftermarket aluminum heads or engine blocks allowed.
18. Engine limited to a single carb or O.E.M. style injection only.
19. O.E.M. Superchargers and turbochargers only.
20. Fuel must be gasoline, diesel, CNG, or propane. No Nitrous Oxide or Methanol.
(B) HOT STREET “PIT”
1. Tires are limited to unmodified military or D.O.T. approved of 38.0” or less in diameter (no 35.0’s).
2. No agricultural/industrial tires.
3. Dual wheels allowed only on vehicles so equipped from the factory.
4. Body swaps allowed. Suspension limited to any O.E.M. style.
5. O.E.M. frames only. No homemade frames allowed.
6. Vehicles in this class must have been available as a four-wheel drive.
7. Engine and all drivetrain components must be in stock location.
8. Heavier drivetrain components may be used.
9. Must have full internal and external body with front bumper. No gutting of floor or bed.
10. Functional flatbeds allowed.
11. Fiberglass replacement body parts must retain O.E.M. dimensions.
12. Must retain full street equipment (lights, wipers, etc.).
13. Maximum exhaust size: 3” all downsize vehicles running dual exhaust, 4” for single, or for dual on full-size vehicles.
14. Must have mufflers, which must exceed exhaust diameter by at least 1” and will have a minimum body length of 8”. Exhaust must extend behind driver’s seat.
15. Fenders may be trimmed for tire clearance.
16. Doors may be removed from CJ, YJ, TJ, FJ40, Scout, pre ’78 Bronco, & similar.
17. Tops may be removed from vehicles with removable tops.
18. Tailgates and passenger seats may be removed.
19. Driver must remain in stock location.
20. No chain drives. Must have transfer case.
21. Must have mufflers.
22. 4, 6, 8, & 10 cylinder Automotive engines only. Engine swaps allowed.
23. Aluminum heads allowed. No aftermarket aluminum engine blocks.
24. Engine limited to a single carb or O.E.M. style injection only. Dominator carbs not permitted on big-block equipped downsize vehicles.
25. O.E.M. Superchargers and turbochargers only.
26. Fuel must be gasoline, diesel, CNG, or propane. No Nitrous Oxide or Methanol.
( C ) OUTLAW STOCK “PIT”
1. Tires limited to unmodified military or D.O.T. approved of 44.5” or less in diameter.
2. No agriculture/industrial tires.
3. Dual wheels allowed only on vehicles so equipped from the factory.
4. Body swaps allowed. Any suspension may be used.
5. Vehicles in this class must have been available as a four-wheel drive.
6. Engine and all drivetrain components must be in stock location.
7. Heavier drivetrain components may be used.
8. Vehicles do not need current registration.
9. Fiberglass replacement body parts allowed.
10. Fenders may be trimmed for tire clearance.
11. May remove doors from CJ, YJ, TJ, FJ40, Scout, pre ‘78 Bronco, & similar.
12. Tops may be removed from vehicles with removable tops.
13. Tailgates and passenger seats may be removed.
14. May remove all glass.
15. Driver must remain in stock location.
16. No chain drives. Must have transfer case.
17. Open headers allowed, and may exit hood or fenders.
18. 4, 6, 8, & 10 cylinder engines. Engine swaps allowed. Automotive engines only.
19. Engine limited to a single carb or O.E.M. style injection only.
20. Aftermarket aluminum engine blocks will not be allowed. Aluminum heads will be allowed.
21. O.E.M. Superchargers and turbochargers only.
22. Fuel must be gasoline, diesel, CNG, methanol, or propane. No nitrous oxide.
(D) ALTERED “PIT”
1. Any size or style of tire allowed.
2. No tire diameter minimum or maximum. May run dual tires front and rear.
3. Tires may be modified for performance gains.
4. No vehicle limitations. Superchargers & Turbochargers allowed.
5. Any safety produced or altered chassis or body may be used.
6. Primary fuel limited to gasoline, diesel, CNG, propane, or methanol. Nitrous Oxide allowed.