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FACTORY STOCK RULES 2013 HUMBOLDT SPEEDWAY
ADDITIONS AND CLARIFICATION
JUNE 25TH 2013. Update
All Additions and Clarification will be in RED.
IN THESE RULES IF IT DOES NOT SAY YOU CAN DO IT, THEN YOU CAN NOT DO IT. IF YOU HAVE ANY QUESTIONS PLEASE CALL.
DIVISION 1 - BODY & FRAME
1960 or newer American made rear wheel drive passenger cars only. 101 inch wheel base ok. Must be stock suspension.
No sports cars allowed (Corvettes or any fiberglass bodied cars.)
1.3 All bodies must be steel OEM panels or steel OEM Replacement panels.
You may use Aluminum body panels for construction of body, All Aluminum body panels must resemble Factory Body Panels, All body panels must be rounded top to bottom. NO SLAB SIDE BODIES WILL BE ALLOWED. Factory Aluminum hoods allowed. Sunroofs must be closed in using steel panel and welded. No "T" top cars allowed. [ Body must match frame.]
1.4 All bodies must remain stock appearing and in stock location on the frame. Roofs may have a maximum of 4 inches rake front to rear.
All glass, chrome, exterior trim & fiberglass body parts must be removed.
All cars must be clearly marked with numbers on 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.
Minimum weight after race with driver is 3000 lbs. Track scales are final. 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. No lead or ballast weight can be mounted on the roll cage above the package tray area and behind the driver. Any ballast inside of the cock pit area must be mounted as low as possible.
Deck lids, fenders, doors, and roof halo may be gutted. Floor pan must remain full and unaltered in any manner. Deck lids must be secured using quick release pins only (no nuts or bolts). Spoilers are allowed, maximum of 6 inches of material, side and center supports can be no taller than the spoiler and shall not exceed 18 inches in length at longest points and be triangular in shape.
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.
Rear trunk floor may be removed. A 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.
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. Factory floor pan must be full left to right and must go past rear of drivers seat.
Plastic after market nose & tail pieces are allowed. Rear of body must remain stock and unaltered under plastic tail piece. Tail piece may not have any holes or openings above stock bumper area.
All bumpers must remain in stock location. Bumpers must be built to fit inside of plastic nose and tail pieces. Bumpers may not be built using material larger than 1.75" X .095 round tubing. (Battering ram type bumpers will not be permitted.)
All cars must have a minimum 5/16" cable or chain on front and rear of car and easily accessible for towing purposes.
You may cut a hole in the hood for air breather clearance. Hood scoops are permitted, no air boxes or ram air devices allowed, no heat shields allowed between air breather and engine compartment.
You may close in rear opera windows with high strength polycarbonate or aluminum only. (No Plexiglas.)
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.
Rub rails may be used. Rub rails must be manufactured with 1" X 2" rectangular tubing only with tapered and capped ends, and must be mounted with 2” side flat to body and use three ½” bolts for mounting. Rub rails may only be used between front and rear wheel openings.
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. Ford LTD Frames may be shortened to 108 inch wheel base.
DIVISION 2 - STEERING & CHASSIS
All steering components must be stock OEM type only. No aftermarket components allowed.
All steering gear boxes must stock OEM type and mounted in stock location.
Tubular A arms are ok must remain in stock mount and location.
2.3 Front shocks may remain in stock location. No adjustable, rebuild able or take-apart shocks are allowed. Heim End shocks allowed on front end but must remain inside the upper A-arm. All shocks must be steel bodies and shafts. No altering the shocks.
NOTE: Frame can be notched for clearance of Shocks Front and Rear.
Only one shock is allowed per wheel. A total of four (4) shocks can be used.
Steering shaft may be made of round tube; a quick release steering wheel is required. Steering quickeners are allowed.
Front springs must remain in stock location. Racing springs are allowed and must be of stock diameter. No weight jacks, adjustable spring spacers are allowed above front springs only, no spring rubbers of any kind allowed.
No bearing type or adjustable bushings are allowed on front suspension parts. Exception is upper A-arm bushings.
All rear suspension must remain stock and in stock location. Rear control arms must be stock length from center to center of mounting points. After market rear upper and lower control arms on rear end are allowed and must be stock lengths. No Adjustable or bushings or heim ends are allowed on rear suspension.
All rear upper and lower control arms must remain parallel left to right.
Rear lower control arm mounting holes can be no further down than three inches below bottom of axle tube and be parallel left to right.
Rear upper control arm mounting holes can be no further than two inches above top of rear end housing or gear area, and must parallel left to right.
Rear shocks must remain in stock OEM location and mounting on rear end.. No adjustable, rebuild able or take-apart shocks are allowed. Heim end Shocks are allowed. Shock must mount in stock location on rear and both shocks must mount on rear of lower mounts. Mounts can be made for mounting the upper Heim on rear shock. Mount must remain as close as possible to OEM location. All shocks must be steel bodies and shafts.
Rear springs must be mounted in stock OEM location and mounting only on frame. Rear springs do not have to be centered on top of rear end. Racing springs are allowed. Rear Coil Springs maximum 5” in diameter and minimum 13” or maximum of 16” tall and must be the same on both sides. A two inch shim may be used above rear springs only. There can be only one spring per wheel, no doubling of springs is allowed. A total of four (4) springs can be used. No weight jacks allowed.
No pull bars, "J" bars, fifth arms, pan hard bars or other traction devices are allowed.
DIVISION 3 ROLL CAGE & DRIVER’S COMPARTMENT
Steering column must remain in stock OEM location. Steering shaft may be made of round tube; a quick release steering wheel is required. Steering quickeners are allowed.
Interior of car may be closed in with .035 sheet aluminum or sheet steel. A 12"X12" Inspection Panel must be installed on the right side of deck and centered in right side door window opening.
Dash may be fabricated using a minimum of .035 sheet aluminum or sheet steel and formed to look like a dash.
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.
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 3 years old.
Ribbon type window nets required. Window nets must be bolted in on the bottom with a release at the top.
Fire extinguishers are required and must be with-in the reach of driver.
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.
A minimum of a six point roll cage is required with a minimum of 3 driver's door bars and 2 passenger side door bars. The roll cage must be welded to the frame of car, offset cages are allowed. (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.
Roll cage must be fabricated from 1 1/2" X.095 wall tubing.
There must be a minimum of three bars in front of driver fabricated with a minimum 3/8" steel rod.
it is highly recommended that the driver's door bars are plated with no less than 3/32" Steel plate and cover not less than 80% of the door area but is not required. This will be required for the 2013 racing season.
DIVISION 4 - REAR ENDS, BRAKES, & DRIVESHAFTS
Floater type rear ends allowed, or any stock passenger car rear end is ok. 9 inch ford allowed, no quick changes or lockers allowed.
You may lock the rear end by using a full spool, mini spool or welding spider gears. No aluminum spools.
A 2" inspection hole is required in the back of the rear end housing. If spool can not be inspected thru hole you will be required to pull the gear for inspection.
All brakes will be stock OEM type only,
All brake calipers, rotors, drums and mounts must be steel. No aluminum brake parts allowed
Rear disk brake is allowed and must be stock OEM type calipers only.
Brake rotors may not be drilled. Rotors must be finned, no solid, scalloped, or wave rotors.
Dual master cylinder ok.
All four brakes must work and lock-up on inspection. Brake shut-off ok or bias adjustment allowed.
Steel drive shafts only. Drive shaft must be stock OEM type 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.
DIVISION 5 - TIRES & WHEELS
The track tire shall be the AMERICAN RACER G60-15/KK704 or 8 inch Asphalt take-off on 8 inch wheel or 10 inch Asphalt take-off on 10 inch wheel.
No mismatching; one or the other.
You may groove, sipe, and grind tires.
All wheels must be 8” or 10” steel wheels. Bead lock allowed on right side only.
Wheel discs (Mud Plugs) allowed but must be bolted or welded or foam type. No ZUS fasteners.
All tires must durometer a minimum of 55. Tire doping, treating or softening of any kind is not allowed. All penalties and fines are at the discretion of Humboldt Speedway Inc.
DIVISION 6 - ELECTRICAL & IGNITION SYSTEMS
One 12 volt battery only, securely mounted outside of driver's compartment.
No voltage enhancing devices allowed
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).
All cars must have a master disconnect switch located behind drivers seat clearly marked ON and OFF. This switch must be functional at all times
Stock HEI or points type distributors only. No ignition control boxes, no MSD or magnetos allowed.
No timing retard, voltage reduction, or traction control devices of any kind allowed.
DIVISION 7 - FUEL SYSTEMS
Pump gas or racing fuel only.
No nitro, alcohol, aviation fuel, or fuel additives of any kind allowed.
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. Fuel cell must be in a minimum 20 gauge steel protective can. Minimum of 12 gallon maximum of 32 gallon fuel cell.
All fuel lines must be routed neatly under the car and kept above the bottom of the frame rails at all times.
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.
No pressurized fuel systems allowed.
Fuel pressure gauge lines may not enter driver's compartment. You must use isolation system.
DIVISION 8 - CARBURETOR & INTAKE
370 cu in or less may run any vacuum secondary Carburetor. Larger than 370 cu in must run Holly 4412 unmodified carburetor. Must meet go-no go gauge.
Choke butterfly may be removed. Choke horn must remain full unaltered and have factory 4412 . No modifications to base plate, venturi, boosters, throttle shaft, throttle plates, or metering blocks. One metering block only. No screw in secondary linkage.
A maximum of 1" spacer may be used with mounting gaskets not to exceed .035 thick.
Any Stock OEM steel 2 or 4 barrel intake manifold may be used. Any aluminum intake manifold may be used on all engines. No air gap manifolds allowed.
DIVISION 9 - ENGINE & TRANSMISSION
Maximum engine size is 360cid for GM, 365cid for Ford and 370cid for Mopar and may use vacuum secondary carburetor. Any engines larger then 360-cid gm, 365-cid ford or 370-mopar must use 4412 holly and can be no larger than 410 cid. All engines must remain in stock OEM location, no engine set back is allowed.
No after market block allowed.
Flat top pistons only.
Stock OEM production heads or listed heads only. Strait plug heads only. Heads must be Factory Valve Angle only. Combustion Chambers can be no smaller then 64cc.No angle or over milling the head surface. Head thickness will be measured off a casting boss on the head, that measurement shall not be less than 1.170 inches plus the gasket thickness. The following heads are allowed. Vortec heads are allowed. G.M. Camel Hump heads are allowed. World product S/R, S/R TorkerI-052, Chevy EQ CH 318A, Vortec EQ CH 350C, RHS Vortec, Dart Iron Eagle S/S, Chevy Vortec S/S, Patriot Vortec, Ford Windsor Jr and Sr. Ford Dart 13301111, Ford Gt, Chrysler EQ CH318A. All Factory and Aftermarket heads must retain all numbers so the can be checked for casting size specifications. Any head casting markings or numbers that has been removed will result in a Disqualification, No exceptions. No Titanium parts are allowed.
Roller rocker arms ok and may be aluminum. No shaft rockers allowed.
7/16" screw in rocker arm studs allowed, rocker studs also may be pinned. Guide plates are allowed. Stud girdles are allowed.
No porting or polishing of any kind allowed on heads or intake. This includes grinding for gasket matching and acid porting, no bowl work at all.
Steel/cast iron exhaust manifolds or headers are allowed, no marine exhaust manifolds, crossover or 180 degree headers allowed. All exhaust must exit toward rear of car.
No light weight engine & valve train parts of any kind allowed. Crankshaft may have cross drilled rod throws. No other lightening allowed on crankshaft.
9.10 Camshafts may be hydraulic or solid lift only. No roller camshafts or mushroom lifters allowed. All lifters must be removable from top side of lifter bore. Lifter bores must remain stock OEM and unaltered in any manner.
Harmonic balancer must be a full size balancer, after market balancers are allowed and all balancers must be steel.
Water pump must be in stock location, aluminum water pumps allowed
Wet sump oiling systems only, oil pump must be in oil pan. No dry sump systems allowed.
Oil pan must have a 1" inspection hole above oil level in pan. We do not want oil draining from oil pan when this plug is removed.
Transmission must be full stock OEM 3 or 4 speed or automatic only. All forward and reverse gears must work.
9.16 Flywheel must bolt to crankshaft. Lightened Steel or Aluminum Flywheel is allowed.
9.17 Clutch pressure plate must be steel and a minimum of 6.250 inches. Clutch and Pressure Plate must bolt to the Flywheel or to the crankshaft.
Automatics must be full Stock OEM size and must be fully working. No stall converters, no Vega converters, no fluid control valves allowed, and no Bert, Brinn, Falcon. Tonganoxie type lightened transmissions are allowed.
All cars must run an explosion proof steel bell housing.
Bell housing must have an 11/2" inspection hole in the bottom for clutch and converter inspection.
Promoter reserves the right to change or clarify any rules to improve competition, safety or cost.
DIVISION 10: ENGINE AND SUSPENSION OPTIONS :
THERE WILL BE NO MIXING OF ANY OF THESE RULES WITH HUMBOLDT SPEEDWAY FACTORY STOCK RULES OR ANY OTHER TRACKS RULES. THERE WILL BE NO TOLERANCE ALLOWED.
You can build your car to follow Humboldt Speedway Factory Stock, Heartland Park Stock Car, Lakeside Speedway Factory Stock, USRA Stock Car Or IMCA Stock Car Rules as Posted By these Tracks and Sanction Bodies. If you do this, you must follow all there rules as written by them. Those rules will be enforced as written, and Teched as written. NO MIXING OF RULES WILL BE TOLLERATED.
All Unported 360 or Less cid-engines (Humboldt Speedway Rules Only) may use a 4bbl vacuum secondary carb.
All Ported 360 or Less cid-engines must use a Holly 4412 500cfm 2bbl carb.
All Unported 361 or Larger cid-engines (Humboldt Speedway Rules Only) must use a Holly 4412 500cfm 2bbl carb.
All Ported 361 or Larger cid-engines (USRA or IMCA Rules Only) must use a Holly 350 cfm carb only
All 360 or less 9.0 to 1 engines (Lakeside Speedway Rules Only) must use a G.M. OEM
4bbl Quadra jet carb only.
NO ROLLER CAMS are allowed with any of the Engine Rules Packages.
No Three Link type cars allowed. No Pull Bars or Lift Bar cars are allowed. No Grand National Type cars are allowed.
You must State the rule package you are using. Or you will fall under Humboldt Speedway Rules.
This Option Package is what we have used in the past for our Factory Stock Challenge Race and have found it to be very competitive. We are hoping buy allowing this option package it will help attract more cars to Humboldt Speedway.
IF YOU HAVE ANY QUESTIONS OR WANT TO KNOW IF YOU CAN BRING YOUR CAR TO HUMBOLDT SPEEDWAY PLEASE CALL THE TRACK OR CARL.
Carl Flower: 785-640-6104