2010 HOBBY STOCK RULES

SEE TRACK MUFFLER REQUIREMENTS

CHASSIS:

Chassis must be an American made passenger car only. Metric framed GM or Ford cars are allowed. Nova chassis are allowed. Station Wagons must be metric framed only with enclosed rear compartment, no other makes or models will be accepted. Frame must remain unaltered in wheelbase and width as defined by OEM original specifications. 1978-1987 metric chassis may be altered for clearance of right front tire only, with maximum alteration not to exceed one-half inch (.5”). Uni-body sub-frames may be tied together. No Camaro, Cadillac, Town Cars, Mustang or Corvette Chassis allowed. No commercial vehicles, convertibles or sports cars. Altering original frame wheelbase is not allowed. Minimum wheel base is 108” per OEM specifications for stock factory production. Allowance to 107.5” for caster adjustment will be allowed at the technical inspection pad.  No tubed chassis. 

WEIGHT:   Minimum weight is 3200 pounds with driver after race. 

CARBURETOR:   Rochester Quadrajet, Edelbrock Quadrajet or Holley #4412  two barrel is allowed. Number must be legible on air horn. Choke horn must be attached. Circle track floats may be used. Fords must run Motorcraft 4 barrel or may run Holley #4412. No machine work on carburetor. Holley carburetors may be mounted on cast iron 4 barrel intake with an adaptor only. No spacers are allowed. No other alterations are allowed. Only one carburetor allowed on engine. No other carburetors are allowed. No spacer or adapter allowed. No injectors or pressure systems allowed.  

CYLINDER HEADS:  

• OEM cylinder heads only with a Minimum 68cc chamber size. No closed chamber heads except 305 heads on 305 engine only. No partially closed chamber heads. No 461 or 462 heads. Open chamber heads only. No Vortec heads. Racecars using GM engines must run 350 heads on 350 engines, and 305 heads on 305 engines. No aluminum heads, no special order heads or factory special order heads. Any open chamber cast iron steel OEM factory production straight plug head is allowed that meets the described requirements. All GM heads are limited to 1.94” intake valves and 1.50” exhaust valves. Heads may be flat milled for surfacing reasons only, no angle milling allowed.  
• Studs may be pinned or screwed in. Push rod guide plates are allowed. Any single valve spring with dampener is legal, no double or triple springs allowed.  
• No porting, polishing, port matching or coatings of any type allowed. No aluminum or titanium components are allowed.  
• Any work done in the bowl area must be done with a 360 degree cut, with the valve guide as the center point. 
• Full roller rocker arms and roller tip rocker arms are not allowed. Poly-locks are allowed. Stud girdles are not allowed.  

ENGINE:  

• May be in stock location or #1 spark plug can be even with ball-joint or forward. #1 spark plug may not extend behind upper ball joint on any car.
• Cast iron OEM blocks only. After-market steel stock type engine mounts are allowed. No machining in lifter valley (except for oil flow drain openings) or in lifter bores.  
• Engine components must be stock. No Chevrolet Bowtie, Ford SVO or Mopar Performance blocks. Stock stroke must be maintained within .002”. No performance parts. Stock OEM rods only. After-market rod bolts may be used. OEM replacement-style pistons with four (4) equal valve relief are allowed. Flat top pistons or dish pistons only, no domed pistons.  No total seal type rings are allowed. Maximum cubic inch displacement allowed is 364 c.i.d. Boring to a maximum of .060” over stock OEM bore is allowed.  

  OEM or OEM Replacement steel or cast crankshaft. Crankshaft must have GM casting number or GM casting letters.  Balancing okay. No splayed main caps. No after market cranks. Crankshaft cannot be lightened (no aerowing, bullnose, knife edge, undercut or drilling of second or third rod throws allowed). Note: Stock Replacement, Chevy Early Model 350, 1 or 2-pc rms - 53 lbs Scat Part # SCT-910442 and #SCT-910526 are allowed. 

   

• Fords: 289,302, or 351 blocks only with Flat Top pistons. Any OEM Ford head is allowed. No aftermarket or Boss heads allowed. Maximum valve size is 1.94 intake and 1.60 exhaust.
• Camshaft and lifters must be hydraulic with a maximum of 450 lift. Measured at the valve. Tech Clarification: In order to maintain a 450 lift on your camshaft you must not exceed a camshaft lobe of  0.280 (thousandths) with 1.6 rocker arms, which will measure a 450 lift. Also, a camshaft lobe of 0.300 (thousandths) with 1.5 Rocker Arms will measure a 450 lift. Be advised that a camshaft lobe of 0.300 (thousandths) with 1.6 Rocker Arms will measure a 480 lift at the valve, which will be deemed illegal. Know what your camshaft and rocker arm combination produces in order to not exceed a 450 lift measured at the valve.  
• Stock style rockers arms only, no full rollers, and no roller tips. No stud girdles.  
• A stock oil pan or a claimer style oil pan is allowed. Oiling must be complete wet sump. No dry sump systems allowed.  Oil Pan Site Plug Highly Recommended for Tech Purposes
• Intake must be cast iron. No high-rise intakes, No marine intakes, No Brzezinski intakes, and no aluminum intakes. No porting, polishing, port matching, acid porting, acid treatments or coatings of any kind.  .
• Any brand, style or size air cleaner is allowed, but no type of ram air or forced air induction will be allowed. Any valve cover combination is allowed.  
• Cast iron water pump is required. Pulleys may be aluminum after-market. Fan must be steel and attached to water pump. Fan spacers may be used. An additional electric cooling fan may be used to assist cooling under yellow flag periods, but all stock fan, pulley and belt components must remain installed.  
• After-market harmonic balancer is allowed.  

IGNITION:  Ignition must remain and be completely stock OEM replacement parts only. Stock HEI ignition is allowed. No MSD modules, no MSD systems or any after-market or GM ignition boxes allowed. Aftermarket starter is O.K.  

EXHAUST SYSTEM:   MUFFLERS ARE MANDATORY, NO ALTERING, NO EXCEPTIONS if running Headers. Mufflers Mandatory: LOBACK MUFFLERS or TWISTER F-SERIES MUFFLERS or Un-altered AUGER STYLE SPEEDWAY INSERT or Un-Altered CUSTOM KRAFT 3 RING INSERT. TURN DOWNS REQUIRED, NO EXHAUST SHOULD EXIT THE SIDE OF CAR- MUST BE ON CAR AT ALL TIMES AT TRACK.  Both Mufflers must be in place prior to the heat and feature races or car will be disqualified for the night, forfeiting all winnings and will not be able to finish the race. 

Note: There will be NO Grace Periods given on mufflers at Gator! 

No 180 degree, shorty or mini headers. Stock cast iron exhaust manifolds allowed. No porting, polishing, acid treatment or coatings. No Corvette-style (2.5” port exhaust) stock exhaust manifolds.  
All Exhaust pipes must extend past driver seat.  

RADIATOR:   Only one radiator must be in stock location. No cutting of hood for clearance.  
Aluminum radiator is allowed. Racing radiator cap is allowed.  

FUEL:   Gasoline only. Racing fuel allowed. No additives allowed. No alcohol.  

FUEL PUMP:   Must be stock OEM style fuel pump. Carter and Holley manual styles are allowed. 

FUEL CELL:  Must be securely mounted to frame in trunk of car between the rear frame rails. Fuel Cell in a Steel Can is required if cell is dropped down between frame rails. A Plastic Fuel Cell may be used only if complete floor pan is in place. Fuel cell is required, maximum capacity of 22 gallons.  

DRIVETRAIN - TRANSMISSION:  

• Any OEM automatic transmission is allowed. Unit must be stock and have a full working torque converter, minimum of 10". Powerglides may have 10” torque converter. No direct drives, valved pumps or bleeder style valve bodies. All forward, neutral and reverse gears must be in working order for all automatics except Powerglides. Powerglides are allowed to have either one or both forward gears, with neutral and reverse in working order.  
• Standard transmissions must be OEM stock, with all gears in working order and a minimum of 10.5” clutch, pressure plate and full size stock flywheel. No mini-clutches or direct drives. Standard transmissions may not use aluminum flywheel of any size.  
• All standard transmissions must have bell housing made of 1/4” thick steel and must cover 180 degrees over the sides and top of the clutch assembly (also referred to as a blow-proof bell housing).  
• No 4-speed, 5-speed or 6-speed manual transmissions, no overdrive transmissions or overdrive units. No Bert, Brinn or internal clutch style transmissions allowed. No ram couplers allowed. Quick-change transmissions or transmission adapters for gear change are not allowed.  
• Car must be self-starting and have working neutral, reverse and ALL forward gears. (ex. 3-speed trans. must have 3 forward working gears.)
• Transmission fluid coolers are allowed, but may not be mounted exposed in drivers compartment.  

DRIVESHAFT:   Driveshaft must be steel and must be painted white or silver. Driveshaft must have a steel driveshaft loop (360 degrees) connected to the frame located within 6” of the front driveshaft u-joint. Minimum size of driveshaft loop is 2” x 1/4” or minimum 1” round tubing. No chain loops are allowed as driveshaft loops.  

REAR-END:   Rear-end must be OEM stock for year, make and model. Any gear ratio allowed as long as no altering of housing is required to allow for installation. (Note: 8.5 GM Rear-end may replace 7.5 GM Rear-end for durability purpose.)

Axles must be locked together at all times with mini-spool or welded. No posi-trac, limited slip, Detroit locker or full spool allowed.  

BRAKES:   Aftermarket racing brake pedal and single racing master cylinder are allowed.  No aluminum brake calipers or suspension braking components. Cars must have a minimum of three (3) functioning brakes. If four brakes are installed, a cut-off valve may be used on one of the brakes, which may not be in the driver's compartment. Adjustable proportioning valves are not allowed. If using three brakes, the fourth brake components need not be present other than rotor, which you can remove outer portion. Rear Disc brakes are allowed with steel components only and with only a single piston caliper.

STEERING: Quick steer boxes of any type or style allowed. Complete OEM stock steering system for year, make and model, from the steering box to the spindles, including steering gear box must be used. After-market steering shaft and quick release steering wheel is allowed. Steering wheel spacer allowed to a maximum of 3”thick. Any stock OEM power steering pump allowed, no aftermarket power steering pumps.                                                                      

SUSPENSION:   No modifying of the suspension is allowed. OEM suspension parts only. No cutting, welding or bending of frame to accommodate suspension changes. Suspension parts must remain absolutely stock for that year, make and model of car. This includes spindles, rotors, upper control arms, lower control arms, ball joints, tie rods, tie rod sleeves, center link, pitman arm, idler arm, steering box and trailing arms.  All upper/lower trailing arm & upper/lower control arm bushings must be present; however they may be replaced with after-market bushings. No mono-ball bushings. Bolt on Spindle Savers are allowed. Upper Control Arm can be strengthened with a maximum of 3/8 inch cold roll or rebar along the outer lip within the groove.  Steel IMCA Stock Car A-Arm part # 91034394 left/right may be used.

SPRINGS:   Racing springs may be used. Rear coil spring maximum length of 13 inches. Adjustable spring spacers are allowed on rear only. Leaf springs may be after market, may use  lowering blocks. Any steel non-jack bolt type leaf spring shackles are allowed, including multi-hole, no sliders. 

SHOCKS:   Shocks must be steel OEM replacement shocks. Shocks must be mounted using the OEM stock mounts in the factory installed location. No heims on shocks allowed. No shock adapters.

ROLL CAGE:   Roll bars must be constructed of 1.5” x .095” steel tubing minimum.  
Main roll bar and halo must be a minimum of 1” higher than the driver’s helmet. Minimum of three (3) door bars on the driver side and a minimum of two (2) door bars on the passenger side. A single bay bar per side is allowed, and may not extend past the idler arm or the steering box. Two vertical bars may be attached to each bay bar to the frame. Maximum size is 1.5” inch O.D., .095” tubing. The center of the roll cage and driver's seat may be no further back than the third (3rd) body mount bushing frame hole for metric frames, and no less than 25" inches forward of rear axle centerline on all other cars. All roll cage welds must be complete and pass safety inspection by tech officials. Floor pan may be cut for cage and sub- frame connectors, but must be replaced by a minimum of 20 gauge steel.  X-bracing under the driver (frame-to-frame) is allowed. 

NERF BARS:   A single nerf bar is allowed on each side. Maximum size 1.5” x .095”. May be attached to main cage only at the front and rear section of the nerf bar. This means only two (2) attachment points are allowed. No open tubing allowed. Tubing must be capped or rounded with no sharp edges. No nerf bars are allowed on the rear outside quarter panel area. Nerf bars may not extend outside of tires.  

WINDSHIELD BARS:   A minimum of three vertical windshield bars are required. Must be a minimum of 3/8” diameter steel and mounted in front of the driver.  

TIRES:   60 SERIES D.O.T. Radial Tires only (No Racing Radials) must be able to have road hazard. Grooved and siped tires are allowed. No softening of tires.  

WHEELS:  Any 8” width steel wheel. Any offset from 2” through 5” is allowed. After-market 5/8” lug studs are recommended. 1” diameter lug nuts are required. Wheel spacers are not allowed with stock studs. Wheel adapters are not allowed. No screws allowed. A protective outer ring is allowed to be welded to the outer lip of the wheel with a maximum size .5” O.D., round or square is allowed. A flat bar of 1.25” may also be used. Bead lock placed on right rear only. 

INTERIOR:   Any oil or transmission fluid coolers in the driver’s compartment must be configured to shield the driver in case of leaks. The cooler lines must be encased in tubing, rubber or steel may be used.  

BODIES: 

Any steel factory style OEM body is permitted, and must have factory hood, truck, roof, fenders, doors, and quarter panels. Bodies must remain in stock location, or be proportionate to stock location when using an alternate body. No Roof Rake. Complete bumper-to-bumper steel body must be retained. Note:1981-1988 Performance Bodies street stock Monte Carlo steel body and Five Star Race Car Body Package #601-101S are allowed. No Camaro Bodies. No Late-Model, No Wide-Bodies, No Aluminum Body Components. 

Enclosure required at rear bumper to trunk lid. Fuel Cell should not be visible. 

Doors must be welded or bolted shut. Doors may be gutted for cage installation. All glass, plastic, fiberglass and trim must be removed from racecar. Upholstery and plastic portion of the dash must be completely removed. No gutting of steel interior except for hood and trunk.  (See Floor for gutting Exceptions) A-Posts may be trimmed and cleaned up to allow for engine set back, but must be reinforced. Window Post may not be removed.

FENDERS: Fenders may be cut for tire clearance only and fender must be within 7” of the tire. Front inside fender wells must be removed. Rear Fender wells may be removed. 

FIREWALL: A full and complete front and rear firewall must be retained. All holes must be sealed with a minimum or 20 gauge steel. The top of Front Firewall (dash area) must remain in stock location. The firewall may be rolled back to allow for distributor clearance not more than 6 inches. Note: If driver's  compartment is enclosed, and decking is in place, the rear firewall may be removed and replaced no less than 25" inches forward of rear axle centerline on all makes and models, with a minimum 20 gauge steel behind the driver /passenger area to ensure the safety of driver. 

FLOOR:  Floorboards must remain in car. All rusted portions of the floorboard must be replaced with minimum 20 gauge steel. The floor pan must remain stock  from front firewall to no less than 25" inches forward of rear axle centerline on all makes and models, and must fully extend from left rocker panel to right rocker panel.

BUMPERS: Stock OEM bumpers are required. Option: After-market plastic bumpers may replace stock OEM bumber. A maximum of 2 in. x 3 in. rectangular tubing or 1 ¾ in. round tubing should be used to support plastic bumper. Bumper loops are required to protect radiator, fuel tank and to be used by wrecker for tow hooks. Maximum 1.5” x .095” steel tubing, maximum 8” tall and not wider than the frame and mounted to the frame or bumper only.  

HOOD: Steel Hood/Trunk Required, No Aluminum. Hood may be hulled and must remain in place at all times. Hood must be pinned. No holes allowed in the hood: therefore no working hood scoops. Any holes in hood must be covered by steel. Quick release hood pins and rear deck pins are required. Hood must make a complete seal dashboard and/or firewall. The engine compartment must not be visible from driver’s seat. 

SPOILER:   Not to exceed 6” and must be attached to rear of trunk lid only. May not extend past the width of the car. Spoiler supports may not be taller than spoiler and may not be longer than 12 inches. Spoiler may be made of aluminum, steel, or Lexan. No Raised Body Lips, Side-Spoilers, or wings on any part of the car. No Window Spoilers. 

IGNITION SWITCH:   All cars must have ignition switch clearly labeled. The car must be equipped with a kill switch to be located within reach when standing outside of the car and easily accessible to emergency personnel.  

BATTERY : Only one twelve volt (12v) battery allowed. Battery and battery box must be securely mounted to car and safely sealed. Battery must be completely encased in an enclosed battery box.  

DRIVER LOCATION:  Driver must be located in the original OEM seat location on the left side of the vehicle only. No back seat mounting of driver’s seat. 

SEAT: Aluminum Racing seats with rib supports are required. No fiberglass or bucket seats. Seat must be securely mounted to chassis (not floor plan) with a minimum of 4 (four) 3/8” bolts, of which two must be mounted in the middle of the seat at the drivers back.  

SAFETY HARNESS:  Racing-type 5-point seatbelts are mandatory. All 5 belts must be fastened while driver is in car and on racing surface. Must be securely mounted with half inch bolts and tabs welded to the cage or frame. Must be less than three (3) years old. If the SFI tag is not present or is illegible, the belts will be deemed illegal.  

WINDOW NET:  A window net with quick release is required. It may be Mesh or Ribbon Type. No Sprint Car Nets.   

SCORING:  Numbers must be 24” high and 4” wide on both sides of the car, and 28” tall on the roof and positioned so it can be read from the passenger side. Cars must be painted and numbered neatly and to be seen easily by the scorekeepers. The number on the roof is the most important number. Reflective vinyl is NOT recommended for roof application due to the poor readability. When positioning the number on the roof it should be readable from the passenger door.