Take the first MH exit. Follow it into town until you get

even with the Albertsons store on your left.

Turn right there beside Taco Johns, go over the rr tracks

 and keep right.

Follow that about a mile and the road will turn left-you

want to go straight into the driveway to Optimist Park.
Option B=go through town on the main street past the

Albertsons and through town following the signs to the

 Air Base. As you get through the main business areas there

will be a Chevron station on your left at the Hwy 51

 intersection (Bruneau highway).

 Turn right at that intersection and go 1/2 mile

 until the road turns 90*right.

At that turn you go left into the Optimist Park driveway.

 

Vehicle Class Description



Stock (S) Class Requirements

Factory Stock
No modifications
Pump gas for fuel only
Maximum tire diameter: 33.0” DOT or OEM stock tires.
Race officials have final say in all class rankings



Super Stock (SS) Class Requirements

No engine swaps.
Aluminum manifolds, headers, carburetor changes allowed.
Naturally aspirated, single carburetor and factory fuel injection are allowed only.
Factory installed Turbos allowed.
No aftermarket ignition boxes. No aftermarket programmers or chips. No aftermarket Heads.
Lifts allowed.
Pump gas or diesel for fuel only.
Must be street legal; functional lights, windshield and no cut bodies. Must have factory bolted on doors and
tailgates if so equipped.
Removable top may be removed. If vehicle came with a windshield installed from the factory it must have a
windshield installed for SS.
No race fiberglass body shells. OEM replacement style fiberglass body parts allowed.
No cut tires, paddles, or tractor tires. A maximum diameter of 36.0” DOT tires.
Race officials have final say in all class rankings



Pro Stock (PS) Class Requirements

Any size engine, or engine swaps, but must be in stock location,
No aftermarket engine blocks.
Aluminum manifolds, headers, carburetor changes allowed. Chips and programmers allowed.
Naturally aspirated, single carburetor and factory fuel injection. Factory installed Turbos allowed. Aftermarket
factory style injection allowed.
Propane allowed on gas engines.
No nitrous oxide.
No cut tires, paddles, or tractor tires. DOT approved tires only.
Removable of fiberglass tops, glass and tail gates allowed.
Trimming allowed of fender wells for tire clearance only.
No race fiberglass body shells. OEM replacement style fiberglass body parts allowed.
Factory style suspensions lift kits and, straight axle swaps allowed.
Traction bars allowed.
Must have a factory style frame. No aftermarket tube chassis.
Topless vehicles must have roll cage.
Factory style transfer cases
Race officials have final say in all class rankings



Powder puff (PP) Class Requirements

Driver must be female.
Any vehicle that can run in the Stock, Super Stock, or Pro Stock Classes.






Mud Modified (MM) Class Requirements

Any engine and modifications
Engine cannot be more than 4” behind the block side of the front axle tube.
Naturally aspired or factory style fuel injection.
NO Nitrous Oxide.
No cut tires, paddles, or tractor tires. DOT approved tires only. Fiberglass bodies and parts allowed.
Body may be gutted but must look recognizable. No narrowed race tubs.
Factory style frame only. No aftermarket tube chassis.
Factory style transfer case.
Must have roll cage and minimum 4 point harness.
Must have 4 wheel brakes.
See Safety Rules below for more recommendations.
Race officials have final say in all class rankings



Pro Mud (PM) Class Requirements

Any engine and modifications.
No blowers
Can run alcohol and injection systems.
Can run Nitrous Oxide
Must be rubber tires.
See Safety Rules below for more requirements.
Race officials have final say in all class rankings



Safety Rules pertaining to Mud Modified and Pro Mud.

Must have U-joint shields on all U-Joints and one loop centered on drive shafts 24” or less.

On drive shafts longer than 24” you will need a minimum of two drive line loops.

Open topped vehicles must have a minimum of a 6 point cage. Structurally altered cabs must have a minimum
of a 6 point cage (Structurally altered meaning: cutting or weakening cab from OEM standard).
Unaltered cabs OK but recommended at least 4 point cage.

Standard transmissions must have “scatter shield bell housing.” Automatics must have a tranny shield or
blanket.

Must have an easily accessible fire extinguisher.

Must have a minimum of a 4 point harness.

Must have a driver accessible power shut off switch.

Must have a well marked, easily accessible master shut off switch.

Must have a firewall separating driver from engine.

It is highly recommended to have at least a single layer fire suit, fire proof gloves, shoes and head sock along
with an approved safety neck ring.



Exhibition Clause

Driver can run in a competitive class without any eligibility for points, cash purse, or trophies. Driver still has to
pay the class entrance fee.

We have tried to make all the rules clear, but due to the variances between vehicles, class positioning will be the
final decision of the Tech Officials. No cheating will be allowed. Any vehicle that does not meet all the safety
requirements for its class will not be allowed to run. The goal is to make all classes as fair and competitive as
possible. These rules are subject to change; it is your responsibility to abide by the rules at all times. Please feel
free to contact the race organizers for more info or tech questions.