2012 HUMBOLDT SPEEDWAY
PURE STOCK RULES
$30 Registration Fee For Year Or $10 Per Night
DIVISION 1 - BODY & FRAME
DIVISION 2 - STEERING & CHASSIS
DIVISION 3 - ROLL CAGE & DRIVER’S COMPARTMENT
DIVISION 4 - REAREND, BRAKES, & DRIVESHAFT
DIVISION 5 - TIRES & WHEELS
DIVISION 6 - ELECTRICAL & IGNITION SYSTEMS
DIVISION 7 - FUEL SYSTEMS
DIVISION 8 - CARBURETOR & INTAKE
DIVISION 9 - ENGINE & TRANSMISSION
All rules underlined have been Changed or Clarified.
Pure stock class is designed to be fun and is not intended to be a high dollar car division.
You must have approval from the track owner to race in this class.
Age limit is minimum 12 years old with parental release form on file.
Engine claim: $500 outright or $200 exchange. Intake to oil pan. The car getting claimed has the option of selling his motor outright or doing the exchange.
Any car that wins 3 Features will pull one head off for inspection at the track.
One driver per car. Points go to the driver, not the car. If someone else is driving the car you are responsible to let the officials know at the sign in gate.
Car can only run in one class for the night of racing.
Humboldt Speedway reserves the right to change any rule at any time for the betterment or safety of the sport. See additional sheets for minimum safety requirements, and other general rules.
DIVISION 1 - BODY & FRAME
1.1 American made 1955 or newer RWD, front engine car, 101” minimum wheelbase.
1.2 No sports cars allowed (Corvettes or any fiberglass bodied cars.)
1.3 All bodies must be steel OEM panels or steel OEM Replacement panels only. Sunroofs must be closed in using steel panel and welded. No "T" top cars allowed. Body must match frame.
1.4 All frames must remain stock and unaltered. If rear frame rails are rusted and need repaired you may cut the frame at a point no farther forward than the vertical center line of the rear end housing and replace them with 2" X 3" .095 rectangular tubing minimum.
1.5 1970-1982 Camaro may be used, you must use a 2"X 2" sub-frame connector under the car only to connect front and rear sub-frames. You can not under sling the rear end of the car. All rear suspension mounting points must remain in stock location.
1.6 Rear firewall must be installed to close off trunk area from driver’s compartment completely. You may use a minimum of .035 sheet aluminum or sheet steel.
1.7 Front firewall must remain full and unaltered in any manner. All holes must be closed off with a minimum of .035 sheet aluminum or sheet steel.
1.8 All bodies must remain stock appearing and in stock location on the frame.
1.9 All glass, chrome, exterior trim & fiberglass body parts must be removed.
1.10 No excessive gutting, you may gut the hood, trunk lid, doors, and fenders for reasonable tire clearance, and under fuel cell for fuel escape.
1.11 No aluminum hoods or trunks.
1.12 Plastic Nose Piece is OK. No Wedge Noses.
1.13 No Spoilers or wings allowed.
1.14 Only OEM stock bumpers front and rear. No extra supports of any kind on or to the bumper.
1.15 Deck lids must be secured using quick release pins only (no nuts or bolts).
1.16 All cars must have a minimum 5/16" cable or chain on front and rear of car and easily accessible for towing purposes.
1.17 Side skirts are permitted. Skirts must maintain five inches of ground clearance at the lowest point and not extend above the first body line on the doors and quarter panels.
1.18 All cars must be clearly marked with numbers on both sides, roof, front and rear. Side and roof numbers shall be a minimum of 18" tall and contrast car color. Front and rear numbers shall be a minimum 5" tall and contrast car color.
1.19 Weight: 3,300 lbs. after race. Any weight added to car must be attached by weight clamps and be painted white with car number on it. Weight must be attached by a minimum of two 1/2" bolts and weight clamps. No bolts welded to bars or frames. Weight must be mounted inside the trunk, no weight mounted up high on roll cage.
DIVISION 2 - STEERING & CHASSIS
2.1 Must have original suspension pieces and in stock locations.
2.2 No weight jacks of any kind.
2.3 No independent rear suspensions.
2.4 Trailing arms must remain stock, stock length and in stock location, for make and model, no offset bushings.
2.5 Stock shocks, no racing shocks.
2.6 Shock must be in stock location and in stock mounts only.
2.7 One shock per wheel.
2.8 No hiem end, aluminum, or spilt valve shocks.
2.9 Racing springs ok, springs must be mounted in stock OEM location and mounting only, maximum of 13 inch rear springs on both sides. Must run the same length on both sides.
2.10 No weight jacking device, spring spacers, or spring rubbers of any kind allowed.
2.11 No adjustable lower blocks.
2.12 Sway bar must remain stock, stock length bolts and spacer (same length) on both sides of the front end, if you choose to run one.
2.13 NO ADJUSTABLE SPRING SPACER ON THE FRONT AND REAR, MAY USE ONES CUT TO FIT ON THE FRONT ONLY.
DIVISION 3 ROLL CAGE & DRIVER’S COMPARTMENT
3.1 A minimum of a six point roll cage is required with a minimum of 3 driver's door bars and 2passenger side door bars. The roll cage must be welded to the frame of car (Camaro's must weld the roll cage to a 6"X6"X3/16" steel plate. Plates must be fully welded to floor pan, then drilled and bolted to a 6"X6"X3/16" steel plate below the floor pan.) front and rear hoops are allowed.
3.2 Roll cage must be fabricated from 1 1/2" X.095 wall tubing.
3.3 No offset cages or set back cages, no further back than the center door post.
3.4 There must be a minimum of three bars in front of driver fabricated with a minimum 3/8" steel rod.
NOTE: It is highly recommended that the driver's door bars are plated with not less than 3/32" Steel plate and cover not less than 80% of the door area.
3.5 Aluminum racing seats only. Seat must be bolted to roll cage only using no less than 3/8" grade eight bolts with flat washers top and bottom of bolts with lock nuts.
3.6 Five point safety belts are mandatory. Safety belts must be bolted to roll cage with a minimum of 3/8" grade eight bolts and lock nuts. Safety belt can be no older than 2 years old.
3.7 Ribbon type window nets required. Window nets must be bolted in on the bottom with a release at the top.
3.8 Fire extinguishers are required and must be with-in the reach of driver.
3.9 A master disconnect switch is required and must be mounted behind drivers seat and clearly marked on and off, and be easily reached from outside of car.
3.10 Steering column in stock location. Quick release steering wheel OK.
3.11 No quick steering reducers.
3.12 Firewall must be stock no moving or straightening, and floor pan must remain original and all holes must be covered.
3.13 Stock master cylinder only, with cylinder and pedal in stock location and mount to the firewall, no pedal extension of any kind.
DIVISION 4 - REAR ENDS, BRAKES, & DRIVESHAFTS
4.1 OEM original type rear end in stock location. 9” Rear ends are allowed with stock drum brakes only. All the mounting points must match all mounting points on the rear end of being removed.
4.2 Gears may be locked, no limited slip, spools ok.
4.3 OEM factory original type brakes only.
4.4 No rear disc brakes. No aftermarket rotors.
4.5 All 4 brakes must lock up on inspection. Right front shut off allowed.
4.6 Stock brake master cylinder only, with cylinder and pedal in stock location and mounted to the firewall, no pedal extension of any kind.
4.7 Steel drive shafts only. Drive shaft must be stock OEM only and painted white with car number clearly marked on it. A drive shaft loop is mandatory and must be fabricated from a minimum of ¼” X 2" steel strap around the drive shaft no further back than six inches from the back of the transmission.
4.8 Must have stock pinion angle.
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DIVISION 5 - TIRES & WHEELS
5.1 The track tire shall be the AMERICAN RACER G60-15/KK704, 8 or 10 inch Asphalt take-off on 8 or 10 inch wheel.
5.2 No mismatching; one or the other.
5.3 Minimum 1” OD lug nuts.
5.4 All tires must durometer a minimum of 55. No doping or softening of any kind allowed. All fines and penalties are at the discretion of Humboldt Speedway Inc.
5.5 You may groove, sipe, and grind tires.
5.6 No aluminum wheels.
5.7 Bead lock ok, right rear only.
DIVISION 6 - ELECTRICAL & IGNITION SYSTEMS
6.1 Battery may be moved and must be securely mounted. If in driver’s compartment, it must be totally encased.
6.2 No voltage enhancing devices allowed
6.3 All wiring shall be neatly bundled and secured to chassis, all wires passing thru holes shall have a Rubber grommet to prevent wires from shorting to chassis ground (rubber nose is not a grommet).
6.4 OEM HEI or OEM point distributor only with one stock 12 volt coil. No MSD or Accel parts.
6.5 No timing retard, voltage reduction, or traction control devices of any kind allowed.
DIVISION 7 - FUEL SYSTEMS
7.1 Pump gas only. No racing fuel. No alcohol.
7.2 Fuel cells mandatory. Maximum 22 gallons. Fuel cells must be encased in an approved metal container of no less than 20-guage steel. Fuel cell must be mounted in trunk area of car only using a minimum of two 1 ½ X 1/8" steel straps wrapped completely around cell and mounted to chassis of the car. Bottom of fuel cell must be set in car no lower than bottom of frame rail.
7.3 All fuel lines must be routed neatly under the car and kept above the bottom of the frame rails at all times.
7.4 All fuel pumps shall be mechanically driven and bolt directly to engine block in stock location. No electric, belt drive, or rear drive fuel pumps allowed.
7.5 No pressurized fuel systems allowed.
7.6 Fuel pressure gauge lines may not enter driver's compartment. You must use isolation system.
DIVISION 8 - CARBURETOR & INTAKE
8.1 Cast Iron OEM Quadrajet or 2 barrel intakes only.
8.2 No aluminum intakes.
8.3 No marine or Bowtie Intakes allowed.
8.4 No spacers.
8.5 4412 Carburetor only. Must be stock and pass a go no go gauge. No down leg boosters, no altering of booster cluster. Throttle shaft must remain stock and must not be thinned or cut in any manner. Stock throttle plates and screws, must not be thinned, cut or tapered Maximum throttle bore 1 11/16 and maximum venturi bore 1 3/8. No modification of carburetor. No boring or polishing of throttle or venturi bore allowed. No Performance Carbs. Carburetor is subject to claim. Carburetor has a claim of $250.00 outright, no exchange. The track has the right to exchange your carburetor with a new one. USE CARBURETOR ADAPTER. Mr. Gasket part #1933 or #1929.
DIVISION 9 - ENGINE & TRANSMISSION
9.1 Must have V-8 engine, OEM size configuration. 360 cubic inch maximum.
9.2 No stroker motors.
9.3 Engine in stock location, no moving motor back or down or up, same brand as car GM to GM, Ford to Ford. Motor mounts in stock locations only.
9.4 Flat Top or Dish Pistons only.
9.5 STOCK COMPRESSION MOTORS ONLY. No Performance parts of any kind allowed (STOCK ONLY).
9.6 Cast iron OEM heads only, no double hump, angle plug or Vortec Heads. No screw in studs or guide plates allowed. No Porting, polishing, bowl cutting, milling or altering of any kind.
9.7 Stock rocker arms, 1.5 stock ratio must be maintained, chevy rockers must have stock triangular insignia and stock rocker nuts, must run 0 valve lash, rocker nuts must be back off ¾ turn before 0 valve lash.
9.8 Smooth idle cams At 800 rpm, with a stock lift of .280 at lobe, 420 lift at the valve, must pull 18in. vacuum. No roller cams, no solid cams, hydraulic cams only. No anti-pump up lifters.
9.9 Cast iron exhaust manifolds only no Ram Horn type exhaust allowed.
No center dump or LT1 type exhaust.
9.10 Aluminum Radiators Allowed.
9.11 Transmission must remain completely stock.
9.12 Standard must have all working gears and stock OEM clutch, minimum 11” flywheel and pressure plate. Cast iron bell housing or explosion-proof bell housing highly recommended. 9.13 Automatics must have all working gears with OEM working torque converter. No converters smaller than 11”.
9.14 No aluminum or Corvette components.
Drivers: if it does not say it, that doesn’t mean you can do it. Check with Humboldt speedway tech before you do anything to your car that is questionable. OEM does not mean High Performance.
