2017 Hobby Stock Rules

Safety

1. Rules apply at all times car is on track. Snell-rated SA2000, SA2005, or SA2010 helmet required.         Roll bar padding required in driver compartment (Fire retardant recommended). SFI-approved full         fire suit required. Fire retardant gloves, shoes and neck brace (or head and neck restraint) required.
2. Right and left seat head supports required if using head restraint system with no neck collar.                 Recommended: Fire retardant head sock and underwear.
3. Driver-side window net required, minimum 16 inch by 20 inch ribbon or mesh style, and must be           mounted to roll cage so latch is at top front of window.
4. Minimum three inch (two-inch with head restraint   system) wide SFI-approved five point safety belt       assembly required (Y-type shoulder harness not allowed), must be mounted securely to roll cage,         and must be no more than three years old. Kill switch required within easy reach of driver and must       be clearly marked “OFF” and “ON”.
5. It is recommended that each racecar have built-in fire extinguishing equipment, but cannot be of the     dry powder type (must be Halon 1211 or equivalent).
6. Drivers should have in their pit area as part of their equipment, at all times, a fully charged dry               chemical, Halon (or its equivalent) fire extinguisher. Ten (10) or thirteen (13) pound fire extinguishers     are highly recommended.
7. Absolutely no plastic except from edge of firewall to body skin and inner wheel tub to body skin or         nose and tail pieces.

Frame

1. Any American OEM full body rear wheel drive passenger car 1964 or newer.
2. Minimum wheelbase of (107”) required for all cars.  Maximum 2” difference side to side permitted.
3. Full frame cars must retain front frame horns. Rear of frame behind rear tires, no further forward than one inch behind factory seam, may be replaced in OEM location with 2” x 3” inch steel tubing with minimum 0.095” inch wall thickness, same length as material removed. Factory seam must remain visible.
4. All unibody cars must have front frame and rear frame tied together. Frames may be X braced. No   station wagon, front wheel drive, or 4 wheel drives allowed. All frame crossmembers must be unaltered in stock location (exception: transmission crossmember may be altered or removed and horn may be removed from center of front crossmember). Must have a 360 degree driveshaft loop no more than 6” behind the front u-joint.  Must be minimum 0.250” x 2 “ steel or 1” tubing.
5. Rear bumpers must be OEM in OEM location and capped at ends to body with steel, welded or bolted. Front bumpers must be mounted minimum (6) inches from front frame horns. Front bumper options: 1 of 2 – Front bumper OE must be complete and capped to body with steel, bolted or welded. 2 of 2 – Fabricated front bumper with rounded corners must be OE height with   minimum 1.5” O.D. (maximum 2” O.D.) with minimum .083” (maximum 0.125”) wall thickness and must be covered with plastic nosepiece.
6. Motor must be in stock location (fuel pump must be in front of unaltered crossmember).

Roll Cage

1. Main cage must consist of continuous hoops, minimum 1.666” O.D. (1.750” recommended) with a         minimum 0.095” wall thickness (low carbon or mild steel recommended). Four post main cage               required and must be properly welded to frame, NOT floor pan. Poor or missing welds may be               deemed unsafe by a track official and may result in disqualification.
2. A minimum 1 crossbar (minimum 1.666” O.D.) required in top halo and must be welded diagonally.       Rear halo must be X braced. Front and rear down bars must be tied side to side. Top door bar must       be a minimum of 36 inches inside to inside of front and rear down bars. Must be a minimum of 26         inches at bottom of top halo measured inside to inside of front and rear down bars. Must be a                 minimum height of 16 inches from top of door bar to bottom of halo. With helmet on and driver               securely strapped in, driver’s head must not protrude above bottom of roll cage. All bars within reach     must be padded with a material accepted by track officials, flame retardant recommended.
3. Minimum of (4) 1.666” O.D. or (3) 1.750” O.D. horizontal door bars required on both driver and               passenger sides (minimum 0.095” wall thickness). Horizontal door bars must be mounted                       perpendicular to frame and must have a minimum of (4) uprights from the  frame to top door bar.
4. Steel door plates made of 18 gage or 0.049” minimum thickness must be securely welded to outside     of driver door bars. Plate must cover from top door bar to rocker and must extend from rear down         bar to 5 inches in front of front edge of seat. Plate must be visible for inspection.
5. Rear kickers (down bars) and fuel cell protection required (minimum 0.083” wall thickness), front           hoops are allowed. If front hoop is not used must have two front kickers (down bars) welded to frame     no further back than front of upper a-arm.  Fuel cell protection and front kickers or hoop must be a         minimum 0.083” wall thickness and 1.250” O.D. A maximum of (2) additional bars may be added for     radiator protection not counting bar tying frame horns together and must be within confines of the         body. Fuel cell protection must be same height as fuel cell and extend from frame rail to frame rail         (maximum 1.750 O.D. tubing allowed) and must remain inside confines of the body.
6. All vehicles MUST have tow loop or strap mounted front and rear and must be easily accessible.

Body

1. 1964 or newer American OEM stock passenger car bodies allowed. All bodies must be unaltered (no chop tops, short bodies, etc.) and remain stock appearing. All glass, plastic, upholstery, rear seats, lights, mirrors and chrome must be removed. Interior tin or other covers not allowed. All exterior body panels must be sheet metal, no aluminum. Only door panels may be fabricated and must resemble stock appearing door. Doors must be welded or bolted secure. All sunroof and T-top openings must be covered with sheet metal.
2. Floor pan and fire wall must remain stock from front fire wall to rear fire wall. Stock body mounts must be visible and minimum 0.375” bolt must be able to pass through body and into body mount. No cutting of floor pan except for roll cage. All large holes in floor pan must be covered with sheet metal equal to or thicker than stock material. All holes in fire wall must be covered with   minimum 0.049” sheet metal or aluminum. Rear firewall must be covered with 0.049” aluminum or steel and must seal driver compartment from trunk area. Rear firewall must be mounted in stock location.
3. Hoods must remain stock dimensions, no custom fabricated hoods allowed. No hood scoops, spoilers, wings, or ground effects allowed. Air cleaner must not protrude through hood. Hood must be secured by a minimum of four hood pins located at all four corners. No tilt front ends, hood must be separate from fenders. Back of hood must be sealed from cockpit.
4. Nosepiece and tailpiece must be securely riveted or bolted in place. No late model nosepieces.
5. Trunk lids must be complete, no shortening allowed. Lids may be gutted. Lids must be secured at all four corners either by combination hinge/pin or pins at all four corners. May use aftermarket rear body covers.  Material between rear fenders may be removed.
6. No overlapping or shortening of body panels. Rear wheel drive 108” wheelbase bodies may be used on 112” wheelbase frames. OEM firewall for frame must be in same location as stock firewall for body used. Body   may be trimmed for wheel/tire clearance only. Front and rear fender wells may be removed.
7. Only rear opera windows may be covered.
8. Appearance:

       a) All racecars must have numbers that contrast to body
           color and must be minimum 4” thick and 18” tall for
           both sides and must be 4” thick and 20” tall for roof
           and must be clearly legible.  All racecars must have
           numbers on the right rear corner of the vehicle and   
           must be minimum 4” tall.

       b) Officials reserve the right to approve or disapprove any
           image of lettering or sponsorship on any racecar or pit
           vehicle entering race surface. Keep in mind this is
           intended to be a family fun facility.

9. Maximum 7” visor allowed on front windshield area. This includes additional tape.
10. Maximum 1” wide by 2” tall steel or lexan rub rails allowed – bolted flush to body.  Steel must be         capped.

Driver Compartment

1. Driver compartment must be sealed off from engine, fuel cell, and ground.
2. No loose objects or weights/ballast allowed in driver compartment. No rear view mirrors.
3. Minimum 3 windshield bars required in front of driver and must be secured. Dash must be level with     hood except for cowl in front of driver.
4. Interior must be open, no decking allowed.
5. All fuel lines passing through driver compartment must be protected by metal or galvanized pipe or       conduit.
6. Factory-manufactured high back racing seats are mandatory, and must be acceptable to officials.           Homemade aluminum, plastic or fiberglass seats are not allowed. Full containment seats are                 recommended. Driver seat may be no further back than rear edge of B-pillar on metric chassis. All         others must be no further back than rear edge of front door. Seat must be bolted in using minimum       0.375” grade 8 bolts and must be secured to frame or roll cage, NOT floor pan. Seat must be                 mounted in left front quadrant of driver compartment.

Electrical

1. One 12 volt passenger car battery only, must be securely mounted between and above frame rails,       and battery must be covered with rubber or nonconductive plastic. Battery must not be mounted in         driver compartment.
2. Starter must bolt in OEM location. Aftermarket starters allowed. Car must have capability of starting       without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to           rear of that   race.
3. GM must utilize OEM GM distributor. Chrysler and Ford may use aftermarket HEI (bushing type             only). Roller bearings are not allowed. Distributors must utilize stock-type components. Circuit board     modules are not allowed. No ignition boxes. Mechanical and vacuum advance may be locked.
4. No unapproved cameras, transmitting or listening devices (exception is one-way RACEceiver radio       by officials), timing retard controls, or digital gauges (including tach). No electronic monitoring               computer devices capable of storing or transmitting information except memory recall analog tach.
5. All wiring must be visible for inspection. OEM type alternator with internal regulator allowed. No             electronic traction control devices.
6. Kill switch required within easy reach of the driver. The switch must be clearly marked “OFF” and           “ON”. All battery cables and electrical must be securely mounted and protected.

Fuel System

1. Automotive gasoline or racing fuel allowed ONLY!  NO E85!  No alcohol!
2. Electric fuel pumps are not allowed.  No piston style pumps allowed; diaphragm style only.
3. A limit of one (1) standard fuel filter is allowed between the fuel cell and the carburetor. Fuel filter cannot be mounted in the driver compartment.
4. No cool cans, cold air boxes, or air cleaner ductwork.

5. Carburetor:

    a)  Option 1 – 2 bbl. OEM Carburetor: GM to GM, Ford to
         Ford, Chrysler to Chrysler; must use unaltered OEM two
         barrel carburetor for that engine, except: booster I.D. 
         may be machined to 0.250”, venturi I.D. machined to 
         1.375” and throttle bore I.D machined to 1.6875” on 
         Rochester carburetor. 0.625” minimum booster height
         on Rochester carburetor. Choke plate must be removed. Car must weigh a minimum 3000 lbs.              with this combination.
                    

6. Fuel cell must be commercially manufactured for racing applications. No boat or stock automotive         fuel tanks. Tanks must be securely fastened inside trunk of   racecar, above the level of stock trunk       floor. Fuel cells must be in steel container. All mounts must be made of steel and surround the fuel         cell and attached to frame or roll cage. No adjustable fuel cell mounts.
7. Must have check valve. Fuel cell vent, including cap vent, must have check valves, a flapper spring or ball-type filler valve.
8. Carburetors may be claimed for $175.00 fee. See claim rules (section 21).

Brakes

1. Steel, unaltered OEM, or unaltered OEM replacement, four wheel disc or disc (front) and drum (rear) brakes. Aluminum GM drums are not allowed.  No two piece rotors.
2. A single OEM or OEM replacement master cylinder only, must be mounted in stock location.  Pushrods my be fabricated for removal of brake booster.  Pedals may be aftermarket or OEM.
3. All calipers must be OEM steel.
4. All four wheels must have functional brakes. Brakes will be tested!
5. Brake pads must contain complete friction surface, sectioning of pads prohibited.

                   

Steering

1. All components must be steel unaltered OEM, in OEM location and match frame. OEM steering             column may be replaced with steel steering shafts (steering shafts must have a joint every 5                 ft., collapsible steering shafts highly recommended). Steel knuckles only.
2. No quicksteer of any type allowed. (This also mean no steering boxes - 6-1 or 8-1 steering                     boxes) Quick release steering wheel coupler mandatory, may be ring or pin design.  Steel or                 aluminum coupler allowed.

Front Suspension

1. All components and mounts must be steel, unaltered OEM, in OEM location and match frame.               Magnet must stick to all components.
2. OEM or OEM replacement type rubber A-frame bushings only. OEM type ball joints only. No sway         bars, spring spacers, chains or cables. Exceptions are: for 1978-1987 GM mid-sized metric frame,         OEM upper A-frame may be replaced using aftermarket upper A-frame (steel or aluminum cross           shaft allowed. Bolt on spindle savers allowed). Upper A-frame mount must remain OEM and cannot       be moved.
3. Coil springs must be minimum 4.5” O.D. and non-progressive.
4. No spring spacers, sway bars, chains, or cables allowed. No jack bolts or spring buckets allowed.         Springs may be cut or heated.

Rear Suspension

1. All components and mounts must be steel, unaltered, OEM, in OEM location and match frame.
2. OEM replacement rubber control arm bushings only. Center of rear lower control arm bolt holes may     be no lower than three 3” from bottom of axle housing and the same on both left and right. Trailing         arm bolts must remain tight.
3. Control arms must be level side to side and non-adjustable.  Control arms may be fabricated of steel     2” x 2” tubing and must remain stock dimensions.  No adjustable arms or swedge tubes allowed.  No     drilling or sectioning of bushings allowed.
4. No independent rear suspension. No sway bars, panhard bars, spring spacers, extensions, chains or cables.  No spring buckets or jack bolts. 

Shocks and Springs

1. One unaltered steel, nonadjustable, stock mount shock, in OEM location, per wheel. No coil-over           shocks, air shocks, remote reservoir shocks. No Schrader or bladder type valve allowed. No coil-           over eliminators.
2. Coil springs must be minimum 4.5” O.D. and non-progressive. 

Rear End

1. OEM and Ford 9” rear-ends and floater rear-ends are permitted, but must be mounted like stock rear-end for that make and model. Truck rear-ends and quick changes are not allowed.
2. Rear-end may be welded or a mini spool may be used, full spools are not allowed. No torque dividing differentials.
2. Rear-end must be centered on chassis.
3. Lightened gears are not allowed. One inch inspection hole in housing required.
4. Gun-drilled or titanium axles are not allowed (axles must be made of steel).
5. All mounts must be securely welded, no floating or clamped mounts.

   


Tires and Wheels

1. 8” or 10” inch wide steel wheels only. NASCAR pull-off slicks. Tires must be used pull-offs, no new         tires. Must have minimum 0.375” studs with 1” lug nuts. Tires must durometer 60 or more after the A     feature.  May run bead locks on right rear only. Tires may be grooved, NO siping allowed.  (Used           G60 or KK704 USED tires allowed and recommended, may be grooved or siped.  Again USED             G60s ONLY!!!!)
2. Softening is not allowed. Solvents of any kind are not allowed. Altering tires with any components or     chemicals which alter the manufacturer’s baseline-settings of the tire is not allowed.

Driveshaft

1. Minimum “diameter, white, steel drive shaft only. Steel slip-yokes and differential yokes only.
2. 360-degree drive shaft loop required, constructed of at least 0.125” by 2” steel or 1”tubing, and             mounted 6-inches back from front U-joint.

Transmission

Automatic transmission

       a) Must be OE automatic with torque converter. All OE    
           forward and reverse gears must be operational.
       b) Torque converter must be a minimum 10” and must 
           have a minimum 0.125” inch plug, and contain three (3)
           quarts of transmission fluid. Must be able to hold brakes
           while is running and car will not die.
       c) Must have approved scatter shield constructed of 
           minimum 0.125” by 3” steel, 270 degrees around 
           flexplate. Flexplate must be full, unaltered OEM, or OEM
           replacement. No manual bump starts allowed.

Standard transmission

       a) 3 or 4 speed transmissions. All OEM forward and
           reverse gears must be operational.
       b) Flywheels must be stock OEM and weigh a minimum of
           sixteen 16 lbs. Clutch must be a minimum 10.5” outside
           diameter. Lightened flywheels are not allowed. 
           Aluminum flywheels are not allowed.
       c) Must have approved scatter shield constructed of 
           minimum 0.125” by 3” steel, 270 degrees around
           flywheel.

 Engine


CRATE ENGINE:

Must use unaltered sealed GM #88958602 or #19258602 crate engine. Must also run IMCA approve Rodchester 2 barrel carburetor and 6200 chip. Effective January 1, 2019, all GM 602 Crate engines must have IMCA Cable-Lock seals.  Upon inspection, any different, altered or missing GM seal bolts and not using required spacer, pushrods, valve springs or rocker arms will result in disqualification and 30-day suspension.

1. Maximum of 368 cubic inches (370 C.I. for Chrysler) is permitted. Note: Cubic inches will be                   checked.  Maximum 3.484” stroke for GM, maximum 3.500” stroke for Ford or Mopar.
2. Maximum 175 lbs. compression ratio.
3. OEM steel passenger vehicle production block only. No GM Bowtie, Ford   SVO or Chrysler W               components allowed. GM approved block numbers are:   3892657, 3914660, 3914678, 3932388,         3932386, 3956618, 3970000, 3970006,   3970010, 3970014, 10066033, 10066036, 10243880,             14010207, 14010209,   14010287, 14016376, 14016379, 10054727, 14088528, 14088548,                   14088552,   14093638, and 14101148. Stroke must match block. No 400 or larger cubic inch parts       allowed. Steel only.  Absolutely no machining allowed on the exterior of the block. 
4. Flat top or dish pistons only, no gas ported pistons. OEM or OEM replacement steel crankshaft only     - cannot be lightened, no 4340 cranks. GM 5.7 or 6-inch stock appearing rod allowed only. All others     must have stock rod configurations with stock appearing rods. Cap screws allowed. Aftermarket rod     bolts allowed.
5. Must be unaltered approved OEM and minimum 76 cc combustion chamber. Only GM OEM                   approved head numbers are: 14079267, 3986336, 3986339, 3986339X,   3986388, 3932441,               376445, 3928454, 3932454, 3876487, 3973487, 3973487X,   3973493, 3951598, 468642, 330862,       333882, 3998920, 3998991, 3998993,   3998997, 3970126. Maximum size valves on these heads         are 1.94” intake and 1.50” exhaust. Valve springs must be stock diameter(1.250”) no beehive                 springs allowed.  Maximum 125 lb. seat spring pressure allowed. Screw-in studs, guide plates and         poly-locks are permitted. Stud girdles are not allowed. May use Engine Quest (EQ) Stock                       Replacement (SR) cylinder head, part number CH350I, head must remain as produced, seat angles     and valve sizes cannot be changed: three angle valve job only (absolutely no casting removal in           valve pocket of EQ head, for any reason); Ford – no aftermarket or SVO heads; Chrysler – no after       market or W-2 heads, 360 cubic inch heads only. 2.04” intake and 1.70” exhaust valves max for Ford     and Chrysler. Bowl hog 80 degree maximum and may not be any deeper than 1.50” into pocket             measured from chamber floor, not valve seat.   Porting, polishing or alterations of any kind to heads,     block, or intake is strictly forbidden.
6. Conventional flat tappet cam/lifters only, cannot alter lifter bores. OEM firing order cannot be                 changed (GM:   1-8-4-3-6-5-7-2).
7. Aftermarket performance harmonic balancers are not allowed. Stock replacement balancers only.
8. Rochester 2bbl only – may use aluminum Edelbrock #2701, 7121, 7181, 7183, or 2915 and Weiand     # 7547-1, 7547, 7515, 8023, 7516, or 7545 (absolutely no modifications to aftermarket intakes).             Absolutely NO port matching allowed.
9. A minimum (1) 1” plug above the oil level in the side of the oil pan is recommended. If not utilizing a       plug, oil pan will have to be removed at time of inspection.
10. Only (1) minimum 2 core radiator allowed in stock location. Overflow tubes must be directed toward     ground. Steel or aluminum V-belt pulleys only.  No electric fans. Aluminum water pumps allowed.
11. Stamped steel rocker arms or roller tip rocker arms only!

Exhaust

 Stock unaltered cast iron exhaust manifolds only no porting or grinding allowed. No Chevy center dump, Corvette, marine, Lt1 or tubular steel type manifolds. No adaptors between head and manifold must be able to use all OEM exhaust bolt holes in head. No two into one exhaust or x pipes must remain duals. Must have mufflers. (3 ring, cone, perforated insert, IMCA 609)


Weight 

WEIGHT: Weight may be securely added in trunk or under the hood, but not in plain view or within the driver’s compartment must be painted white with car number. Car must weigh minimum 3000 lbs. with driver after race.
     

NO MIXING BETWEEN HOBBY & FACTORY STOCK RULES


OPTION B - FACTORY STOCK

BODY: Any American made stock passenger car body on a stock unaltered full frame, or Chrysler unibodies.  No front wheel drives. No Camaro or Mustang bodies.  Stock appearing aftermarket plastic nose or tail pieces are allowed. Rear of car must be sealed off, no exposed fuel cell. No spoilers (even if factory equipped), wings, skirts, air scoops, hood scoops, or anything that alters stock appearance. Bodies cannot be moved from the original body mount rubber bushing no more than +/- 1” cannot be less than 5 ½” from ground. A front visor is allowed on the windshield area MAX 7 inches. No side or rear window visors allowed.  Sunroofs and T-tops must be reinforced and enclosed. No nerf bars. Maximum one inch wide by two inch tall steel or lexan rub rails allowed - bolted flush to body. All glass, plastic, upholstery, lights, mirrors, and trim must be removed. Cars must be stock appearing. No cutting, channeling, shortening, or modifying of body is allowed. No excessive trimming of fenders or hoods allowed, must maintain stock OEM appearance. All doors, fenders, and window openings must remain stock appearing and OEM dimensions and be the same on both sides. No straight slab sides. No enclosed interiors, or decking allowed. Front edge of rear deck cannot be more than 8” forward of center of rearend and must have at least 2” continuous drop from front to rear. Rear of dash can be no more than 35” from the center of the distributor or 28” from back edge of the center of stock hood. Original OEM front and rear firewalls must remain in stock location and be full and complete.  Cars must have a complete stock steel roof mounted in OEM location and OEM rake and angle for model.  All openings should be covered as to isolate the driver, subject to track approval. Racecar body should be maintained in such a manner as to keep a presentable appearance. 

Each track will enforce one of the following, tracks may differ but one of the following will be enforced:

1). Cars without stock steel front fenders will have 20lb weight penalty in front of engine. Cars without stock steel hood will have 10lb weight penalty in front of engine. Cars without stock OEM windshield posts attached to firewall must add 20lbs. in front of the engine total of 50 for all three, must be lead ballast.

OR

2). Maximum of 52% Rear Weight.

FRAME:  Frame must be full and complete.  Cannot be Widened, Narrowed, Shortened, Lengthened, or be Cut, Bent, or Altered to change Suspension Brackets.  Rear of frame behind upper shock mounts may be replaced with round, square, or rectangular tubing.  Cannot narrow right rear frame for tire clearance. No frame alterations allowed.  All Bars forward of cage must be lower than the hood.

 BUMPERS: Stock type rear bumper required, a fabricated front bumper may be used with the following conditions: cars with aftermarket nose pieces- the bumper may extend past frame rails for support and reinforcement.  Must be behind nosepieces. Cars without nosepieces- the bumper may not extend past front frame horns. NO SHARP EDGES. 

 ROLL CAGE: Minimum four-point cage, minimum size 1 ½ “O. D. by .095” wall thickness.  Minimum three bars in driver’s side door, and two bars on passenger side door (three bars if passenger in car). Four-point quick release seat belt and harness required for driver and passenger. Racing seats required. Must have window nets and firesuit for driver and passenger.  Must have at least three bars in front of driver and passenger in windshield area.

 ENGINE: Must be stock for the make and model except no 400’s or larger small or big blocks.  Cast piston only, Chevy must use 4 equal valve relief pistons. OEM crankshaft only- cannot be lightened. No aerowing, bullnose, knife edge, undercut or drilling of second or third rod throws. OEM steel Connecting rods only must remain stock OEM length, weight and shape. No lightening of any parts. Aftermarket water pump, mini starter, pulleys, harmonic balancer and oil pans okay. Aftermarket power-steering pumps okay. Metric cars may run a 350. NO stroking or de-stroking. Engine must be in stock location. Solid motor and transmission mounts okay. Maximum cranking compression 175lbs. (ignition off, engine turned over 5 times). Oil pans must have at least 1”inspection hole.

 CAMSHAFT, VALVETRAIN, AND CYLINDER HEADS: Hydraulic cam and flat tappet lifters only.  .447 maximum lift. Must maintain 14” of vacuum at 1200 rpm. 1.94 maximum intake valve diameter, 1.50 maximum exhaust valve diameter on Chevrolet engines. No hollow valve stems. Stock size and shape valve springs and retainers. Stock length and diameter pushrods only. Stamped steel 1.5 rockers on Chevy, 1.6 on Ford and Chrysler, NO roller tips. Open chambered heads only, must be unaltered, O.E.M. NO porting, polishing, or gasket matching allowed. The only GM head numbers allowed are 14079267, 3986336, 3986339, 3986339X, 3986388, 3932441, 376445, 3928454, 3932454, 3876487, 3973487, 3973487X, 3973493, 3951598, 468642, 330862, 333882, 3998920, 3998991, 3998993, 3998997, and 3970126. Screw in studs and guide plates ok. 305 engines may use 305 heads (no vortec).

CARBURATION AND FUEL SYSTEM:  Cast Holley 4412 -2 barrel only. Must be unaltered. Choke plate may be removed. 4412 must be cast into choke horn of carb. Maximum spacer and adapter 1” combined total. Fuel pump must be in stock location for make, NO electric pumps or fuel injection even if factory equipped.

 EXHAUST: Stock unaltered cast iron exhaust manifolds only no porting or grinding allowed. No Chevy center dump, Corvette, marine, Lt1 or tubular steel type manifolds. No adaptors between head and manifold must be able to use all OEM exhaust bolt holes in head. No two into one exhaust or x pipes must remain duals.

 INTAKE MANIFOLD: Stock OEM unaltered aluminum or cast iron intake only. No aftermarket or stock high performance or high rise. No bowties. No porting, polishing, cutting or gasket matching.

TRANSMISSIONS: Any stock type automatic or manual. Automatics must have stock appearing working 10” torque converter cannot be smaller with ring around it. No direct drives. Transmission Cooler ok.  Manual must have single disc 10.5” clutch, flywheel and pressure plate must be steel minimum 16lb steel flywheel. No mini clutches. Steel drive shafts only must be painted white and have a loop 6” from front u-joint.

 FUEL: Pump or racing gas only. No additives or smells. Fuel cell must be secured in trunk any part of fuel cell cannot be forward of any part of rear end.

 SUSPENSION: Front and rear suspension must be stock unaltered OEM for that make and model of frame, ball joints, spindles and all components. No air shocks. No alterations to any part of the suspension or frame will be allowed. Any spring in stock location no spring rubbers, no adjustable weight jacks of any kind, must sit in unaltered stock mounts.  May run IMCA type upper control arms. Sway bars must be stock for make and model mounted in OEM mounts. No suspension stops of any kind.  Shocks must have stock type rubber ends, no screw on type rod ends even if welded, must be mounted in stock location on frame, control arm and rearend. No bulb-type, threaded body, coil-over, or remote reservoir shocks. No external or internal bumpers or stops no Schrader valves on shocks. 

 REAR END: Stock rear-end for make and model no modifying axle bearings or length. All brackets and control arm, shock mounts must be in stock location. Gears may be locked must use stock unaltered ring gear carrier may weld or use bolt in locking blocks. No full spools, Detroit lockers or torque sensing devises.   

 STEERING / DRIVER SEAT: Steering boxes must remain in stock location. Aftermarket steering wheel and quick release steering coupling are recommended. Quick steer boxes allowed.  NO part of driver seat may be no further back than 25” forward of center line of rear end housing.

 RADIATORS: Any (1) radiator that fits in original location without any body modifications is allowed. Water pump mounted fans only, No electric fans.

 IGNITION: One 12 volt battery only must be mounted securely in rear of driver’s compartment or trunk area. One stock type distributor, module and coil in stock location only.  Ignitions on/off switch must be clearly marked. No traction control devices of any kind. No digital gauges or tachs.

 BRAKES:  May use any (1) one master cylinder.  Aftermarket pedal OK.  Must have at least 3 working brakes. Right front may be blocked. No bias adjustment is allowed. Disc brakes allowed in rear No aluminum or composite rotors or calipers. Must use steel stock type rotors on rear disc. No lighting of components.

 TIRES AND WHEELS: 8” maximum wide wheels allowed, 15” diameter steel wheels only, wheel covers and mud plugs right rear only. No bead locks or screws allowed. NO bleed-off valves. Must run 1” steel lug nuts. Approved Hoosier asphalt pull-offs only, 35 or higher, must durometer 51 or higher. No grooving, siping, or softening allowed. Both rear tires must be Hoosier F45’s or F56’s.  

 WEIGHT: Weight may be securely added in trunk or under the hood, but not in plain view or within the driver’s compartment must be painted white with car number. Car must weigh minimum 3000 lbs. with driver after race.

 COURTESY RULE: Any car with “minor” rule infractions will be allowed to race (1) event. Must be determined before the race. Cars with infractions are subject to weight penalty.

Protest    

Any driver that finishes on lead lap and have competed in the prior 2 weeks competition may protest another driver that finishes in front of him or her. All protests must be submitted in writing within 15 minutes after completion of race. Once the protest has been initiated the protest cannot be recalled. All protests must be made in cash only and must be given to the appointed track official.  All protesting drivers may be accompanied by one additional person. Protested drivers are allowed two additional people to aid with removing of protested parts.  Teams are allowed 1 hour for removing any components except in the case a rod and piston need be removed in which 1 hour 30 minutes will be allowed. All teams are responsible for having tools necessary for disassembly. If components cannot be removed within allotted time the protested driver will be disqualified.

        a) Section protest –   $250.00, $25.00 goes to track – 
            Driver may protest suspension, engine, transmission, or
            fuel. If fuel is protested laboratory fees will be taken
            from protest fee.  Protests may be anonymous, 
            however, only protesting driver may be present.
        b) Complete protest - $425.00, $50.00 goes to track – 
            Complete vehicle may be inspected, only one head may
            be removed, protesting driver chooses which side. If 
            fuel is protested laboratory fees will be taken from
            protest fee.  Protests may be anonymous, however, only
            protesting driver may be present.

If protested driver is found legal, protest monies will be issued to protested driver less fees.
If protested driver is found illegal, protest monies will be returned to protesting driver less fees and penalties will apply to protested driver.

        a) Violations – First offense, Loss of points and winnings
            for current night. Second offense loss of points year to
            date and suspension up to four weeks in   which 
            decision will be made by track director.

Any driver may protest a total of 2 times per season. A driver may only be protested by another driver a total of 2 times per season.
Southern Oklahoma Speedway has the right to protest any driver at any time in which a $50.00 teardown fee will be given to protested driver if found legal.
All decisions will be made by Southern Oklahoma Speedway officials and all decisions are FINAL.

Carburetor/Shocks/Distributor Claim

Any top 4 finishing driver may have their carburetor claimed for $200.00 and swap, shocks or springs claimed $20.00 and swap each. Distributor $100.00 and swap.  Claiming   driver must have competed for the prior two weeks of competition at Southern Oklahoma Speedway without disqualification. Claim must be submitted to tech official 5 minutes after race is completed in writing. Claimed driver is responsible for removing own components and must not leave the tech area until claim is complete.  Drivers may be claimed a total of 3 times per season. Driver may NOT claim another driver finishing in a position behind them and may not claim the same driver more than once per calendar year. If claim is denied penalty will be loss of points year to date and loss of current night winnings and will not be able to claim the remainder of the season. Southern Oklahoma Speedway has the right to claim after the third claim has been met.
Claiming drivers will not be eligible to claim again for a minimum of 2 weeks and achieving a top 4 finish in an “A” Feature main event.