Street Stock Rules

FORWARD

 New Humberstone Speedway officials attempt to be fair and maintain consistency with the application of theses rules.  Our objectives are fairness and safety.  For every organization to be successful, it must have good rules and enforce them fairly.  Cooperation of officials and competitors will assure our sport a bright future.

 PREFACE

 These Street Stock rules supersede the rules contained in the previous year’s rulebook, as amended, and shall remain in effect, until they are superseded by the rules contained in the next annual Street Stock rule book.  New Humberstone Speedway reserves the right to amend and change any rule, during the current year.

 The rules and regulations set forth below are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events.  These rules shall govern the condition of all events, and, by participating in these events, all participants are deemed to have complied with these rules.  No express or implied warranty of safety shall result from publications of or compliance with these rules and /or regulations.  They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to participants, spectators or others.

 New Humberstone Speedway officials reserve the right to reject any entrant for any reason they deem necessary.  All participants are to conduct themselves in a manner that reflects favourably on the sport at all times.  All fines, and/ or suspensions will be in effect at all New Humberstone Speedway race events.  The interpretation and invoking of the rules, published herein shall be determined by New Humberstone Speedway Officials, at their professional discretion.

 Any deviation from rules, specifications, car weights and engine parts will be subject to the approval of our Chief Tech Inspector.  However, should any approval prove to be a unfair advantage to the overall competition, Management reserves the right to rescind any approval it might have given with one week’s notice.

 New Humberstone Speedways Chief Tech Inspector has the final say on all technical legalities of the night’s events upon completion.  Our Chief Inspector reserves the right to disqualify a car and/or driver based on the night’s events in accordance with rules and proper racing procedures.

 After a car has passed tech, it may not be altered to any specification that would make it illegal.  Any car that carries an event tech sticker may still be subject at any stage to further tech and could face exclusion form the event.

 Please be advised that all rules will be applied strictly as per this rule book.  Please do not try and bring a car that is out of spec.  You will have to do work at the track to return it to spec before being permitted to compete.  Tech is required to ensure that all cars are safe and evenly matched.  It is in YOUR OWN INTERESTS to prepare a legal and safe car.

 The Street Stock division is designed as a beginner class.  Drivers from other divisions may not move down to street stock with-out prior consent from the race director.

 
Competing Models:

1.     Open to all 2 door North American made steel bodied passenger cars from 1969 and newer.

2.     Minimum factory wheel base of 106”

3.     Wheel base must match year, make and model of car used a tolerance of Plus (+) or Minus(-) 1 inch will be allowed

4.     No cross breeding of frames and bodies

5.     No convertibles, sunroofs, T-tops, trucks or station wagons allowed

Appearance:

1.     Car body and overall appearance must retain all stock dimensions. 

2.     The body must be mounted in the original factory stock location in relation to the frame.

3.     No chopping, Channeling, or changing original bodylines.

4.     Stock dimensions of windshield pillars must be retained.  Windshield pillar and angle of windshield must remain stock.

5.     All glass must be removed.  Windshield must be removed and replaced with full screening (one inch square maximum)

6.     Headlight, parking, and taillights must be removed and neatly covered

7.     All cars to be adequately numbered with 18” high numbers on both sides, roof and rear deck for scoring purposes.  No duplicate numbers.

8.     Car must be neatly painted and lettered.

9.     TAKE PRIDE IN YOUR RACECAR AND OPERATION.

 
Frames:

1.     Frame must remain stock from front to rear. 

2.     Rusted out rear clips may be reinforced from rear end back. 

3.     Unibody cars may tie sub frames together with straight ties only

 
Interior and Firewalls:

1.     Car must retain stock firewall and stock floorboards in original locations.

2.     Rust holes must be patched

3.     Rear firewall must be completely closed off from truck with 18 gauge (.0XX”) steel. 

4.     No Aluminum allowed

5.     No cockpitting of Interior.

6.     All interior must be gutted (Upholstery, seats, door skins, etc.)

7.     All doors must be welded or bolted shut

 
Bumpers:

1.     All cars must run adequately secured stock bumpers.

2.     Rubber replacement bumpers allowed.

3.     No bracing outside the bumpers.

4.     Bumper shock brackets must be welded and or bolted.

5.     A 1” X 2” X .120” Side rub rail is allowed, one on each side of the car

6.     Side rub rail must be tight to the body.

7.     Must have ends beveled.

8.     No sharp edges.

 
Suspension:

1.     Front and rear suspension components must be stock for year make and model of car used.

2.     Stock mounts to be used in their stock location and position,

3.     No switching of left and right control arms.

4.     Location of ball joints may not be moved.

5.     Steering linkage must be stock O.E.M. production parts.

6.     Springs must be stock type and mounted in original location (coil for coil OR leaf for leaf.

7.     Only four (4) springs allowed per car.

8.     Rear trailing arms must be stock O.E.M. for year, make and model of car used.

9.     Rear spring pad spacing on axle housing must be stock dimensions (centre to center) and must not be offset.

10. Rear springs must be mounted in symmetrical (The same) location or position from left to right.

11. Stock spring spacing only.

12. Rear shackles only, No sliders.

13. No wedge or weight adjustment devices.

14. One shock absorber per wheel mounted in stock location.

15. Stock mounting shocks only, No adjustable shocks allowed.

 
Roll Cage:

1.     A minimum Four (4) point roll cage with approved driver protection is mandatory.

2.     Roll cage must be constructed of steel tubing using 1-½” O.D. X .120” wall thickness or 1-¾” X .095” wall thickness.

3.     No extra bracing on outside of car allowed.

4.     Three (3) horizontal bars minimum running between the front and rear upright bracing are required on the driver’s side and must bow outward. (Not including the frame).

5.     Front center windshield post minimum 1-¼” X .120” mandatory.

6.     Upper roll cage must have center roof bar. 1-½” O.D. X .120 wall thickness OR 1-¾” O.D. X .095” wall thickness.

 
Brakes:

1.     Stock O.E.M. brakes mandatory on all four wheels and must be in 100% working order.

2.     No heavy duty or limited production parts.

3.     No brake shut off devices allowed.

4.     Only O.E.M. stock steel callipers, rotors, and hubs allowed.

 
Drive Train:

1.     Only stock production automatic three (3) speed transmissions allowed.

2.     No modifying of transmission in any manner is allowed.

3.     All gears must be in working order.

4.     Must remain stock and unaltered.

5.     All cars must have a stock unaltered V-8 torque converter.

6.     The minimum diameter. Torque converter that can be used is 11”

7.     Drive shaft must be steel O.E.M. type.

8.     Drive shaft must be painted white.

9.     One front 360 degree drive shaft hoop (mounted towards front half of drive shaft) from 1” X .095” tubing is mandatory.

10. Rear end must be same as make, model of chassis being used.

11. No limited slip or torque sensing type rear ends permitted.

12. Rear end may be locked by welding spiders or using steel mini spool.

13. Any gears can be used.

14. Racing wheel studs are mandatory.

 
Electrical System:

1.     The self starter must be in working order and located in stock position.

2.     Only standard factory O.E.M type production starts permitted.

3.     All cars must start under their own power.

4.     Stock O.E.M. H.E.I. Distributor.

5.     No after market coils or modules.

6.     Battery must be installed in engine compartment

7.     Battery must be securely fastened.

8.     Positive terminal end to insulated to prevent shorting (use of rubber is suggested).

Fuel cell:

1.     Fuel cells only.

2.     Fuel cell is to be located in truck area.

3.     No stock location tanks allowed.

4.     No sloppy installations allowed.

5.     No aluminium tanks allowed.

6.     Fuel line from trunk to engine must be one continuous line.

7.     Trunk must have to be opened to refuel

8.     PUMP GAS ONLY - NO ADDITIVES

 
Exhaust system:

1.     Unaltered stock cast iron exhaust manifold only allowed.

2.     Mufflers are recommended

3.     Maximum exhaust pipe dia. is 3.00.

4.     Pipe must run under floorboard and exit behind the driver.

5.     Stock cast iron intake and exhaust manifold must be used (unaltered) no center dump manifolds.

6.     No two in one exhaust

7.     No h-pipes.

 
Radiator:

1.     Radiators must be of stock type only.

2.     Aluminium radiators allowed

3.     No electric cooling fans or pumps.

4.     Radiator must remain in front of the engine in the stock position.

5.     Radiator fan must be steel only.

 
Wheels:

1.     Steel racing type wheels allowed.

2.     Maximum steel wheel width of  eight inches (8”)

3.     Minimum two (2) inch and four (4) inch maximum offsets allowed

4.     ½ inch studs, minimum, are mandatory on all four wheels.

5.     Must have one (1) inch lugs and quantity five (5) on all four wheels. (20 wheel nuts per car)

 
Tires:

1.     Optional Engine rule Hoosier 8” spec tires only.

2.     Maximum tire sizes P235 with 8” tread.

3.     Dot numbers and tire stampings must be visible.

4.     No mud, snow, recaps, or special racing tires.

 
Weight:

1.     All must weigh a minimum of 3000 pounds after the event with driver.

2.     Any additional weight must be securely fastened with two, minimum ½” diameter, grade 8 bolts

3.     No added weight in the driver’s compartment.

4.     Added weight must be painted white with the care number painted, engraved or stamped on each piece.

 
Engine:

1.     One (1) small block V-8 engine only.

2.     All engine blocks must be standard production and have stock external and internal measurements.

3.     Engine must match make of car used.

       Chevrolet…………………350 C.I. Only

       Ford………………………351 C.I. Only

       Chrysler…………………..360 C.I. Only                        

4.     Must remain nine to one (9:1) compression 

5.     No after market or aluminium blocks.

6.     No altering or cross breeding of engine components.

7.     All engines allowed up to .060”” overbore.

8.     No special or high performance engine components allowed.

9.     All engine parts and components must have been available on stock O.E.M. production passenger cars.

10. Stock production O.E.M. Passenger car cast iron two (2) barrel intake manifolds only.  No truck or marine manifolds allowed.  No alterations or modification to manifolds allowed. No coatings of any type allowed on or in manifold with the exception of paint only on the top exterior surface

11. Stock production O.E.M. passenger car cast iron exhaust manifolds only.  No altering, grinding, acid dipping, or enlarging allowed to manifolds.  No high performance, Z-28 or LTI type ex-manifolds allowed.

12. Only stock production O.E.M crankshafts permitted.  Stock stroke only.  No lightening of crankshaft allowed.  No cutting or trimming of counterweights.  No grinding or polishing of external surfaces (excluding rod and main journal surfaces).  Normal stock production type balancing only.

13. Only stock production O.E.M. production forged rods only.  Stock length rod to be used (Chevy - 5.7”).  No polishing or lightening of rods.

14. Only cast, stock type flat top pistons with a full skirt are allowed.  Pistons must be three (3) ring type and use all 3 rings.  Pistons must be used as manufactured.  No lightening.  Pistons must be four (4) eyebrow type with top eyebrow matching bottom eyebrows (mirror image).  No parts of piston bay extend past block deck.

15. Only stock production O.E.M. Cast iron heads

       - heads must have stock internal and external measurements

        -Maximum valve size allowed is 1.94” for intake and 1.50” for exhaust

        -Stainless valves allowed.  No titanium valves allowed

        -No under cut valves allowed, only stock valve stem diameter allowed with no tolerance.

        -Stock valve spring diameter only

        -Steel valve spring retainer only

        -No altering or modifying of combustion chamber.  No grinding, polishing, or valve enshrouding allowed in chamber.

       - No porting, polishing, grinding, acid porting, blending or filling of ports allowed.

        -Stock O.E.M. rocker arms only (Chevy 1.5).  No roller type rocker arm.

        -No Chevy small type combustion chamber cylinder heads.

        -No center bolt style cylinder heads.

        -No push rod guide plates

        -3/8 inch screw in rocker studs allowed

16. Hydraulic flat tappet cams only.  Maximum lifts .390” for intake and .410” for exhaust 9 both measurements are from the valve).  Must use hydraulic valve lifters with stock lifter measurements.  No roller, solid or mushroom lifters allowed.  Maximum intake lobe lift is .264” and maximum exhaust lobe lift is .277” (Both checked at the push rod). No solid or roller cams.  No gear or belt driven cams allowed.

17. Stock O.E.M. harmonic dampeners only.

18. 1) Only one stock unaltered 2-Barrel carburetor allowed.  Must be stock production O.E.M passenger car carburetor and must match make or car used.  Maximum venture size is 1-3/8” and the throttle bore size must be 1-11/16”.  No truck or marine carburetors or components allowed.  Choke shaft and choke plate may be removed.  No altering or booster cluster.  No thinning of throttle shaft or butterflies.

19. 2) Optional carburetor- One Holley # 4412 2 BBL Carburetor will be allowed.  Must be box stock.  Only modifications allowed are:

        -Choke plate and shaft may be removed

        -Power valve rating, accelerator pump cams, and accelerator discharge nozzle size may be-changed.

        -Jets may be changed.

        -Drilled hole in throttle plate may be enlarged.

       - No other changes will be allowed.

20. A one (1) inch adapter plate with two (2) holes matching Carb bores will be allowed.  No tapered holes allowed in adapter plate.  Maximum thickness at adapter plate with gaskets is 1.050.

21. Engine must be in stock location and stock crank height.  After market oil pans, valve covers, and air cleaners are allowed. Including Claimer style, kicked out steel oil pans.

22. No coatings of any kind including paint are allowed on any interior engine part.

23. An interior engine part consists of any part that can not be seen on an engine in complete race ready form

24. No coatings on exhaust manifolds.

Optional engine:

1.     Engine must be mounted in stock location.

2.     All engine blocks must be standard factory production passenger block.

3.     Engine block and component parts must retain all standard stock external and internal dimensions.

4.     No after market or aluminium blocks.

5.     Zero deck allowed on blocks with maximum .060 overbore allowed.

6.     Internal polishing of the engine block is not permitted.

7.     Chevrolet - 350 C.I., Ford - 351 C.I., Chrysler - 360 C.I. Allowed.

8.     Stock hardware on engines.

9.     Factory production unaltered replacement three ring, four (4) eyebrow flat top cast aluminium pistons allowed.  No modifications.

10. Only factory production or O.E.M. standard steel pistons pins may be used.

11. Only factory production steel connecting rods permitted.

12. All rods must maintain the standard stock rod length for engine block used.

13. No Oldsmobile rods.

14. No modifications of any kind.

15. Any factory production or O.E.M replacement steel oil pan.

16. No oil coolers allowed.

17. No accusumps or external oil pumps allowed.

 Cylinder Head:

1.     All cylinder heads must be factory production stock cast iron 882, 445, 624 head only.

2.     Identification and part numbers must remain on the part being used with no alteration.

3.     Any attempt to alter, change, or eliminate part numbers will result in that part ineligibility.

4.     Maximum intake port of 160 c.c. and maximum exhaust port of 60 c.c. with minimum 74 c.c. combustion chamber.

5.     No internal grinding except valve seats.  All cutting in reference to the valve joint must be centered off of the centerline of the valve guide.  Upon completion of the valve job, the bowl area under the valve seat down to the bottom of the valve guide must still be the same configuration as far as shape and size as it was from the manufacturer.  Must retain same configuration.

6.     No work below valves.

7.     Screw in studs and poly locks allowed

8.     Maximum valve size Intake 1.94 Exhaust 1.50

9.     Stainless steel exhaust valves allowed.  No neck down valves, no titanium valves.

10. No bronze guides, but bronze liners allowed.

11. Minimum head gasket thickness .040.

12. Stock diameter single valve springs and retainers only.

13. No dual valve springs.

 
Crankshaft and Harmonic Balancer:

1.     Only factory production cast iron crankshafts with no other modifications of any kind minimum .030 under size.  Part # 3932442 or # 14088526

2.     Drilling for balancing only.

3.     Must remain stock stroke.

4.     Knife-edging, polishing, undercutting, and lightening is not permitted.  No modifications.

5.     Factory production or O.E.M. replacement harmonic balancers are permitted.

 
Camshaft and Timing Chain:

1.     Hydraulic camshafts only.

2.     Not to exceed .450 lift on intake and exhaust with stock diameter lifters.

3.     No roller cams allowed.

4.     No mushroom cams allowed.

5.     No gear or belt driven cams.

6.     Timing chain and gear may be of a roller type or O.E.M. replacement chain and gear.

 
Exhaust Manifold:

1.     Stock cast iron exhaust manifold must be used (unaltered) - mo center dump manifolds.

 Rocker Arms:

1.     1.5 stamped steel rockers arms only.

2.     No roller tip or roller rockers.

 
Intake Manifold:

1.     Only an aluminium four barrel single plane intake as cast box stock with no modifications or grinding permitted

2.     Manufacturers and part numbers that are legal are as follows:

     Weiand X-Celerator, Chevrolet # 7547, Ford # 7515, Chrysler # 7545

     Edelbrock Torker II Chevrolet # 5001, Ford # 5021, Chrysler #5076

Push Rods:

1.     Stock length and diameter push rods.

2.     Chevrolet 350 - 1.250 diameter spring with installed height of 1.70

3.     Ford 351 - 1.500 diameter spring with installed height of 1.82

4.     Chrysler 360 - 1.500 diameter spring with installed height of 1.65

 
Carburetor:

1.     Holley R4412 that must remain box stock.

2.     Carburetor must me mounted parallel to intake.

3.     Choke may be removed, throttle shaft may be welded, jets and power valves may be changed.

4.     A 1” adapter with two (2) holes matching carb bores is mandatory.

5.     Two .030 gaskets only.

6.     Throttle shafts must remain standard and mus not be thinned, cut or altered.  No modifications.

7.     No air induction plastic inserts or other devices to direct air to intake.

Safety:

1.     Window Nets are mandatory on driver’s side.

2.     No mirrors or reflective devices allowed.

3.     Aluminum high back racing seat is mandatory. Must be securely fastened to the roll cage and or frame in six spots, Four (4) on bottom and two (2) on seat back.

4.     No fibreglass seats allowed.

5.     No floorboard installations.

6.     The seat must be completely positioned to the left of the centreline of the car.  (On the driver’s side).

7.     All bars and sharp contact areas around driver must be padded.

8.     Seat belts dated 2002 or new is recommended

9.     Minimum three (3) inch wide, five-point racing seat belt harness mandatory.

10. Both ends of lap belts must be securely fastened to the frame and roll cage with high quality bolts, not less than 7/16 inch in diameter.  ½ “recommended.

11. No frayed or torn belts.

12. The steering wheel centre must be padded.