Pure Stock Rules

2017 phoenixPure Stock Rules

Changes in Blue – revised 2/10/2017

Note: Drivers competing in the Pure Stock division on any given night may not compete in any other division at that event. Division to be ran is declared at pill draw and cannot be changed. This will be enforced on a per event basis only, meaning a driver may run in different divisions on separate weeks.


  1. Cars must have minimum of 106” wheelbase. No shortening of factory wheelbase. Rear wheel drive cars only.
  2. Uni- body cars must tie frames together with 2″ box tubing, and roll cage must be welded to tubing added to frame.
  3. No fabricated X’s or other bars are to be added to underside of frame. Stock cross member only.
  4. Steel body panels only. After-market body panels are allowed, but must match the original stock body. Fabricated body panels allowed, but MUST MATCH ORIGINAL STOCK BODY LINES. Car must remain stock appearing. Homemade body panels may be deemed illegal in 2018.
  5. No fiberglass body panels or hoods with the exception that Fiberglass roofs are allowed.
  6. No skirting or body panels lower than stock. After market plastic nose and tail pieces allowed.
  7. All Window openings must remain in factory location and must maintain original factory sizes. Neither the body panels, nor any fins or sails may reduce these opening sizes. To accommodate the egress needs of drivers of all sizes, the top of the driver’s and/or passenger’s door may be cut down a maximum of 3″. No moving of door bars is allowed if this option is used. All sharp edges must be covered. As an alternative, the entire roof line and cage halo may be raised up to a maximum of 3″ If the roof and cage are raised, the roof and supports must remain as close to stock appearing as possible, and the roof must be raised the same amount at all sides and corners. 
  8. Car body must match make of frame(GM to GM, Ford to Ford, Etc) and match model year. Cars must have full floor boards, and full fire walls in stock location. No fabricating of fire walls,. Patching of rust holes is mandatory.
  9. A single 5″ spoiler on the rear of car is allowed. No side supports. 
  10. All chrome, glass and light fixtures must be removed inside and out on body of car. No mirrors allowed. Numbers must appear on both doors and roof of car.
  11. No frame changes, seat must be in stock location, and steering column must be stock length. At no time will there be exceptions to this rule to move driver back in the car, other than for size and safety of the driver
  12. All doors must be welded shut.
  13. Competition type 4 point cage mandatory with a minimum of 3 bars in driver’s door and 2 bars in passenger door. Door bars must be at least 1 ½” tubing. All roll cage joints must have gussets welded in, including door bars. Front hoop bar to protect radiator OK. Down bars from back of roll cage to rear of frame required.
  14. Three vertical bars are required in windshield area for driver protection.
  15. Fuel cell 24-gallon maximum racing type fuel cell in completely enclosed steel container (NO ALUMINUM ALLOWED). All cells will be mounted to a 1″ x 1″(minimum) square tubing frame that is welded to frame supports. Minimum of 4 – 2″ steel straps completely around cell. Fuel cell must be mounted in the trunk area. The trunk area must have a firewall between it and the driver’s compartment that is completely sealed. Frame must be reinforced with bars to roll cage.
    1. The following fuel cell rules are Highly Recommended and may become mandatory in the future.
      1. The only fuel cells that are approved are those that meet and/or exceed the FIA / FT3 or SFI 28.3 specifications.
      2. Fuel cells must be used in accordance with the FIA / FT3 or SFI 28.3 specifications. Alterations of any kind will not be permitted. (Example: alterations to top plate, alterations or removal of foam, etc.)
      3. Fuel valve plate, fuel pickup and fuel return fittings must be on the top of the fuel cell.
  16. Stock bumpers front and rear. Aftermarket nose and tailpieces allowed. Fabricated bumpers may only be used if covered with an aftermarket nose and tailpiece. A hoop is allowed on front and rear bumper. Support braces to front hoop can be run to frame but must be within 1 in. proceeding no further back than the radiator. Rear hoop can be braced inside trunk to frame. Bumper ends may be cut, but must be capped.
  17. Brakes calipers must be factory design. Pedals and master cylinders may be factory or aftermarket design. No brake adjusters or shutoffs.
  18. Two driveshaft hoops are mandatory. Drive shafts must be painted white.
  19. Batteries:
    1. Only one twelve (12) volt battery securely mounted will be permitted.
    2. The battery must be securely mounted with positive fasteners and brackets.
    3. The battery terminals must be insulated or enclosed with a non-conductive material that will prevent contact with any part of the race car should the battery become dislodged from the battery mount.
    4. If the battery is located in the driver’s compartment, it must be in a marine type case. The case must be securely mounted to the frame, either directly or by means of a steel rack. The steel rack must be constructed of minimum 1″ square tubing, and be securely welded to the frame or cage in a manner that will not allow the box or rack to move. An additional metal strap or bar must secure the marine type case to the rack or frame. All bolts must be secured through steel tubing or the frame of the car. Bolting through the body or floor pan is not sufficient. 
    5. One (1) mandatory battery disconnect switch must be installed. The switch must be clearly labeled with off/on direction. The switch must be directly in-line with the NEGATIVE battery cable and be capable of completely disconnecting the NEGATIVE terminal of the battery from the race car. Negative or “ground” wiring connections must not be made anywhere from the battery negative terminal to the input side of the disconnect switch. 
  20. Any attached weights must be securely attached to the frame, painted white or bright silver and have the car number clearly displayed on them. Weights of up to fifty (50) pounds must be secured by two (2) half inch (1/2”) Grade 5 or higher bolts on two (2) weight clamps. Weights secured by one bolt and/or held on by a means other than accepted by the Technical Inspector will not be permitted. Due to the high risk factor involved, any car that loses lead weight during an event may be fined or face disqualification.
  21. No weights may be attached to rear bumper.


  1. All shocks and springs must stay in stock location. No jack bolts or jacking devices front or rear.
  2. Only steel body, non-adjustable shocks allowed. Heim ends on shocks only are allowed.
  3. Stock A-frames only.
  4. Larger ball joints may be used for safety. Must remain in stock location.
  5. On leaf spring cars, stock spring and stock length spring shackles only, No adjustments on shackles and no lowering blocks.
  6. Nothing attached to rear end of car other than stock components.


  1. Transmission must be stock for make and model of car. Ex. G.M. to G.M – Ford to Ford- Mopar to Mopar.
  2. Rear ends can be changed to Ford design for safety but must be mounted to body design springs and shocks and in stock location.
  3. Transmission must be automatic and must retain torque converter. No after-market power glide or TCI. No direct drive transmissions. Must start under own power. Must idle in all gears.
  4. Stock OEM trailing arms and brackets must be used. No lengthening or shortening of arms. Must remain in stock location. No tubular bars, bearings, or heim joints.


  1. The following tires compounds are the only tire compounds legal:
    1. Street tires no larger than DOT P255-G60-15.
    2. Hoosier 26.5/8.0-15 – A40, A40S, H40, M-30s, M-60
    3. Hoosier 27.5/8.0-15 – A40, A40S, H40, M-30S, M-60
    4. Note: After June 1st the A40 will no longer be legal.
  2. The Right Rear tire must be one of the following AT ALL TIMES.
    1. Hoosier 26.5/8.0-15 – H40, M-60
    2. Hoosier 27.5/8.0-15 – H40, M-60
  3. Grooving of tires is not permitted. 
  4. Siping is only permitted on the A40s, H40, and a Right Rear M-60
  5. Buffing of tires is allowed.
  6. No mud and snow tires allowed.
  7. Defacing or altering any of the manufacturer’s identification markings, letters, words, numbers, on any tire will not be permitted.
  8. Mud plugs are permitted on all four wheels. Bead locks will be permitted on the right side only.
  9. Wheel discs shall be fastened to the wheel using a minimum of three (3)- 5/16 inch or (3) 1⁄4 inch diameter magnetic steel hex head bolts. 
  10. The use of wheel discs with any other type of fastener will not be permitted.
  11. Maximum 8 in. wheels.
  12. All wheels must be conventional one-piece magnetic steel and must be mounted with lug nuts. Aluminum, plastic and/or carbon fiber wheels will not be permitted.
  13. Oversized lug stud and lug nuts required on right side. 1 in. lug nuts required.
  14. All wheels must be fastened to the hub with five lug nuts.
  15. Tire softeners and/or chemicals designed to alter the chemical characteristics of the tire and/or the tire surface will not be permitted.
  16. Any chemical treating of tires is illegal.
      1. Officials reserve the right to check and or confiscate any tire used in competition at any time. A driver is fully responsible for any tire used in competition regardless of the source of the tire and/or when the tire was put on the car.
      2. Officials can take tire samples using two methods.
        1. Officials can remove samples using destructive methods. In this case, no tires will be returned regardless of results. Drivers with treated tires will receive no compensation. Drivers with untreated tires will have the tire replaced.
        2. Officials can remove sample grooves from the tread of the tire. No compensation will be given to the driver for tires.
      3. Any tire used in competition may be protested for chemical treating by any driver competing in that same individual event(same feature, heat, qualifications, etc). Protest must be made to track officials prior to when the protested car returns to pit area. Protester must present $500 cash to official at time of protest.
        1. If tire is found to not have been treated, the protested driver will receive $150 for tire replacement even if destructive methods are not used.
        2. If tire is found to be treated, protester will receive $400 of their fee back with $100 being held for processing fees.
      4. All prize monies of drivers with tires taken for testing will be held until lab tests are received. If tire samples do not match the factory benchmark for that compound, the driver forfeits all monies won that night, not only those from the specific race where the driver was protested. (ie – A driver using a tire during qualifying that is found to be illegal will forfeit any monies won in heats, consis, or features that night.)
      5. Drivers with tires that do not match the factory benchmark will be disqualified for the event the samples were taken, be suspended 5 races, lose all championship points earned up to that point, be disqualified from any contingency programs for that season, and be subject to a $1,000 fine. These penalties are for a driver’s first offense. Further offenses will be handled on a case by base basis.
      6. Any driver refusing to submit tires for any testing or intentionally avoiding officials attempts to secure tires will be subject to the same penalties as those found using chemically altered tires.
      7. Any driver making a protest then backing out of protest may be subject to fines, suspensions, and/or other penalties.



  1. No aluminum heads or blocks. Motor must be stock for make and model of car.
  2. No dual line or double pump carbs allowed. One four barrel or two barrel Holley only. No aftermarket carbs. Max 1 inch spacer allowed. No alcohol. Linkage can be changed to use solid rod design for safety. Fuel line inlet must remain in factory position.
  3. All cars must fitted with a restrictor plate. Restrictor plates will be available at the track and only these restrictor plates will be allowed. Plates must be unmodified in any way. Any car or driver having a modified restrictor plate will be disqualified, suspended, and/or fined.
  4.  Cast iron intakes only. No bowtie, no marine, no aluminum, and no high-rise intakes. With stock Quadrajet intake only, an additional adapter is allowed between intake and restrictor plate.
  5. Headers optional. Exhaust turndowns must be minimum 6 inch behind firewall, max 12 inch behind firewall.
  6. No roller cams. Roller rockers allowed(steel only). Ignition must be stock. No MSD or after-market distributor allowed.
  7. Motors must be in stock location. Steel motor mounts are allowed. #1 spark plug must remain in front of ball joint. No moving of firewall.
  8. Mufflers are mandatory. 100 decibel maximum. Any car losing mufflers will forfeit points and prize monies for that night.
  9. Gasoline only; no electric fuel pumps.
  10. Weight rule 3200 lbs. with driver.


Safety equipment specifications listed below are listed as a guide and are only a minimum standard. These minimum standards may not be sufficient enough to protect a driver from injury or death from some incidents. It is the responsibility of the driver, car owner, and crew to ensure that the safety equipment on the car is properly installed, working as intended, and is sufficient to protect the driver from any incidents that occur. This may include using safety equipment that goes above and beyond the minimum specifications and recommended equipment listed below.

  1. Seats:
    1. Full containment type seats constructed of aluminum to the general design specifications of SFI 39.2 standards are highly recommended. Design should include comprehensive head surround, shoulder and torso support system, energy impact foam, and removable head foam.
    2. Up fitting a current seat with bolt on kits will be permitted with a seat manufacturer produced kit and a base seat acceptable to the seat manufacturer. Components should include comprehensive head surround, shoulder and torso support system, energy impact foam. Must be installed in accordance to seat manufacturer’s instructions.
    3.  Seats must be used as supplied and instructed by the seat manufacturer with the exception of trimming the length of the left side head surround for the purpose of egress only. If the left side head surround is trimmed to a distance that is less than the most forward surface of the drivers helmet (usually the area crossing the chin) then a left side head net meeting the SFI 37.1 must be installed with a quick release latch.
    4. Seats must be mounted to a seat frame that is welded to the race car frame/roll cage structure. Attaching points, angles, and materials for the seat frame and mounting of the seat to the seat frame must be in accordance to the seat manufacturer’s instructions.
  2.  Restraints:
    1. The use of a 5, 6 or 7 point driver restraint system certified to SFI Spec 16.1 or 16.5 is REQUIRED no exceptions. All driver restraint systems shall not be in excess of 3 years of age past the date of manufacture. The use of a 7 point driver restraint system is strongly recommended. All mounting points of the racing harness MUST be mounted properly in accordance with the manufacturer’s instructions, and securely mounted to the chassis with the use of grade 5 or better hardware.
  3. Window Nets:
    1. Window Nets certified to SFI Spec 27.1 are highly recommended and must be mounted in accordance with the manufacture’s instructions and technical director’s satisfaction.
  4. Driver Worn Equipment:
    1. A helmet certified to Snell SA2010/FIA-8860, Snell SA2015/FIA-8860, SFI 31.1/2010 or SFI 31.1/2015 is REQUIRED.
    2. A driver suit certified to SFI Spec 3.2A/5 is REQUIRED.
    3. Gloves certified to SFI Spec 3.3/5 are REQUIRED.
    4. Socks and Shoes certified to SFI Spec 3.3 are REQUIRED.
    5. Head and Neck Restraint Devices/Systems are Highly Recommended
    6. At all times during an Event (practice, qualifying, and competition), drivers must connect their helmet to a head and neck restraint device/system certified to SFI Spec 38.1. The device/system must display a valid SFI Spec 38.1 label.  The head and neck restraint device/system, when connected, must conform to the manufacturer’s mounting instructions, and must be configured, maintained and used in accordance with the manufacturer’s instructions
  5. Drive Line:
    1. A driveline “sling” is REQUIRED.
  6. Fire Suppression:
    1. An in-car Fire Suppression system is Highly Recommended.
    2. All race cars should be be equipped with a thermally deployed automatic fire suppression system. The fire suppression system will consist of a DOT approved cylinder manufactured from aluminum or steel with a capacity of ten (10) lbs. of fire extinguishing agent, steel or steel reinforced lines, and two (2) thermally activated discharge nozzles.
    3. All systems must meet or exceed SFI 17.1 specifications.
    4. Systems must be fully charged with ten (10) lbs. of DuPont FE-36, 3M NOVEC 1230, or Fire Aide and display a legible and valid SFI and manufacturer label depicting fire extinguishing agent, capacity, and certification date. Cylinders that or beyond useful certification date must be inspected, serviced and re-labeled by the manufacturer.
    5. Cylinders must be mounted forward of the fuel cell. Cylinders must be securely mounted to the frame/roll cage assembly. The certification label must be unobstructed and easily accessible for inspection when the mounting is complete.
    6. The cylinder must be connected to the nozzles with steel or steel reinforced lines.
    7. Two (2) thermally activated nozzles must be used. One (1) nozzle must be located directly above the fuel cell in the fuel cell area and the second nozzle must be located in the driver cockpit area.
    8. An optional manual override cable may be added to the system.
  7. Drivers under the age of 18 are REQUIRED to have a HEAD SOCK, window net, gloves, and either a neck collar or a head and neck restraint system in addition to all other required safety equipment in place.


  1. NO two-way radios. No crew to driver radio or transmitted communications of any kind.
  2. NO “in-cockpit driver controlled” electronic devices of any kind permitted.
  3. NO computer controlled devices of any kind permitted
  4. NO rearview mirrors of any kind permitted.
  5. Raceceivers are mandatory at all times. 
  6. Electronic scoring is used to score all laps of all races. The scoring order of the electronic scoring system will me used for all positions and all laps unless an error occurs. This will be at the judgement of race officials only.
    1. A Westhold style transponder is mandatory at all times. 
    2. Transponder must be located on the rear axle tube.
    3. Mounting the transponder at any other location can result in disqualification, loss of positions, or other penalties.