PURE STREET/FACTORY STOCK

 

Any driver is eligible to run the pure street/factory stock class but if driver runs in any upper division at any point during the season and wins 3 times, he/she cannot return to the pure street/factory stock class.  This resets every calendar year.

 

MATERIALS:

No ceramic or carbon fiber parts allowed.

 

RADIATOR:

One, mounted in front of the engine for the purpose of cooling water and, optionally, to cool an automatic transmission.

 

ENGINE:

Location: Stock location for Make / Model / Year.

 

ENGINE OPTION 1:

360 cubic inch MAXIMUM, dished or flat top pistons only.  Must be GM in GM, Ford in Ford, etc.  No crossbreeding of parts.  No stroked or de-stroked engines allowed.  Stock rods for cubic inch engine used.  Stock production heads.  Double hump heads allowed, VORTECS OK. Effective 2024 season: Vortec replacement heads with no more than 170 intake runners and 194/150 valves.  No bowtie heads allowed.  Can use dual plane intake.  If you run a replacement head, you will have a 3200lb weight rule.  If you run stock OEM heads with stock casting numbers, your weight limit is 3000lbs.  No porting, polishing or port matching allowed.  Maximum intake valve 1.94, maximum exhaust valve 1.50.  Maximum valve spring diameter 1.26”.  Stock 2 or 4 barrel steel intake. You can run any intake, cast iron or aluminum, no high rises allowed nor any type of air gap intake. 

 

Screw in studs and guide plates allowed.  No roller tip or roller rockers, no stud girdles allowed, no roller lifters, no roller cams or ceramic lifters.  Cam lift at 450 Max.  No carburetor spacers, adapters only. 

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CARBURETOR: 

Holley 4412 carburetor unaltered.  Choke flap can be removed.  No after market distributor, stock distributor ignition only points or HEI, may run high output coil but no ignition box Aluminum pulleys allowed on crank and water pump only.

 

FUEL:

Racing gasoline OKAY. NO E-85. No aftermarket additives. No cool cans.

 

ENGINE OPTION 2:

Chevy 602 sealed crate motor.  Must run stock 4412 Holley carburetor with a 1” max thickness adapter only. There will be NO weight break for this option. This motor should be the same as received from GM.

 

RODS: OEM length. Example: SBC must be 5.7”.

No I-Beam rods, 6” rods, or H-Beam rods allowed.

No lightening/weight-reduction of crankshaft or rods.

 

EXHAUST:

36” of 2” exhaust pipe from the end of the collector is now optional. .  Street style headers allowed with 1 5/8” primary tubes with 3” collector. (NO OVER RAIL/FRAME HEADERS OR CROSSOVER HEADERS ALLOWED). 

 

 

BODY:

Stock appearing body for car being claimed.  Maximum of 40” rear deck height. It must have a defined drop from the rear window to end of the rear deck. (OPTIONAL: up to a 3” spoiler may be added.) Hoods may be gutted.  You may use the sheet metal for doors and body panels…MUST HAVE FACTORY BODY LINES…NO FLAT, SQUARE BODIES!!!  Bodies must maintain factory look, no skewing body from front to rear, bodies must run parallel with frame rails. MUST MAINTAIN STOCK APPEARANCE…THIS INCLUDES THE NOSE AND TAIL PIECE.  Aftermarket nose pieces allowed.  Stock appearing roof, must be in stock location (no lowering).  MUST have a minimum of 12” clearance on any window opening. NO GRACE PERIOD ON THE PURE STREET/FACTORY STOCK RULES!! 

 

All safety and general rules apply.  Rear must be covered (must go from the top of the rear deck to the top side of the frame. (Optional: you may leave the far left and far right side of the rear covering panel open). Firewall may be altered for distributor clearance only if necessary.  No engine set back or offset.  No cut out holes in firewall.  Front and rear firewalls must be in stock location.  Firewall can be stock or fabricated. Any bars necessary to ensure rigid frame and radiator protection will be permitted behind the front and rear bumpers provided they do not extend past the body.  May use 22 or 24 gauge sheet metal deck, it must be open on driver side.  Must have original factory front and rear firewall and floor pan.  No cutting of fender wells except for tire clearance only.  Front inner wheel well panels optional.  Trunk lid may be gutted.  Stop sign post material allowed between front and rear fenders on side of body to protect sheet metal and paint jobs.  Stock unaltered floor pan required unless needs repairing due to excessive rust.  Seat must be no more than 24" from center of rearend housing. There must be a rear firewall to protect the driver placed behind the drivers seat and before the fuel cell.

MUST have a minimum of 3 drivers side doorbars with 1/8” steel plate. Right side MUST have a minimum of 2 doorbars. 

NO FUEL LINE in drivers compartment unless contained in conduit or pipe.

ALL GLASS must be removed.  No mirrors are allowed.

 

 

CLUTCH AND TRANSMISSION:

Single disc clutch only 10 ½” minimum, no aluminum flywheel.  Stock type flywheel to weigh no less than 14lbs, stock type pressure plate no less than 13lbs.  Stock disc type clutch and flywheel required.  Stock torque converter (13”) required with automatic transmissions.  Transmission may have shift kit installed.  ¼” steel plate surrounding stock bell housing or blow proof bell housing required.  MUST HAVE inspection hole in bell housing. No racing clutches or lightened flywheels or small torque converters or racing converters. Torque converters must weigh minimum of 38 lbs.

 

(FOR THE 2027 SEASON: Brinn or Bert transmissions and triple disc clutch will be allowed)

 

DRIVESHAFTS:

OEM steel, painted WHITE.  Universal joints are to be similar in design to OEM units. Minimum drive shaft diameter is 3”.

 

STARTER:

Full size or mini starter okay. MUST HAVE STARTER!

 

WATER PUMP:

After market okay.

 

POWER STEERING PUMP:

Stock location. Aftermarket power steering pumps and steering quickeners are okay.

 

LEAD WEIGHT:

MUST be mounted with TWO 1/2 inch bolts per piece of lead and be painted WHITE with your car number on it.

 

BRAKES:

May use production disc brakes. MINIMUM of 2 rear and 1 front brake. NO FLOATING BRAKES ALLOWED. Dual Master Cylinder allowed.  Driver CANNOT adjust brakes from inside the cockpit.

 

BATTERY:

May use 2 batteries. If battery is located in drivers compartment it must be in an enclosed battery box and securely fastened. No bungee cords or rachet straps. NO EXCEPTIONS.

 

FRAME:

Stock frame for car body used.  Uni-bodies MUST connect front and rear with tubing or use roll cage to strengthen frame, provided they do no extend past the body.

 

SHOCKS:

NO ALUMINUM BODY SHOCKS ALLOWED. NO ADJUSTABLE SHOCKS ALLOWED. Shocks must be mounted in stock locations.  Left and right side shocks must match same installation points and be parallel to each other top and bottom.

 

FRONT SUSPENSION:

Must be stock as produced by the manufacturer.  Shocks must be in stock location using stock mounts.  No screw jacks.  Racing springs and racing shocks allowed.  Steel shocks only. 

 

Only stock proportioning valves are permitted. After market brake pedals allowed but cannot be adjustable from drivers cockpit. Quick disconnect steering wheel and quick steer ok.  All other steering components must be stock.  No threaded adjustable buckets allowed of any type, or welded adjustable buckets or spacers.  Aftermarket upper A-arms can be run in stock mounted location (allowed to have a 1” difference between the left and the right A-arm in length).

 

REAR SUSPENSION:

Stock as produced by the manufacturer, except rear end housing may be replaced with an 5 or 6 lug rear end.  Ford 8” or 9” rear end ok (GM included).  Floater rear ends allowed.  Stock suspension must be retained.  Shocks must be in stock location, top and bottom with no shock spacers.  You are allowed up to a 2” shock extension on left rear only.  No chains, cables or any sort of suspension device that limits suspension travel front or rear.  No add on traction devices or modifications.  Adjustable shackles and racing springs allowed, no sliders.  No adjustable lowering blocks, aluminum lowering blocks ok.  No bearing style or heim joints allowed on rear end control arms (upper or lower).  Aftermarket bushings will be allowed.  Rear end may be locked.   Lower threaded adjustable bucket allowed on left rear only (must be on bottom side on left rear rear-end housing). No threaded adjustable buckets allowed anywhere else.  No spacers allowed anywhere else. Lower trailing arms must be stock and mounted in stock location as produced from factory.  Lower trailing arm mounts must be mounted equal length on both sides from the bottom of the rear end housing to the center of the bolt hole 2 ½”, +/- ¼”.  Aftermarket rubber or steel trailing arm bushings are allowed, no bearing-type bushings allowed in trailing arms.

 

ACCESSORIES:

Other items must be OEM style but may be after-market parts.

PROHIBITED: Any titanium or other similar sophisticated lightweight parts. Mounting the engine so that the centerline of the crankshaft is more than 1” from the center point between the 2 top ball joints.

 

WHEELBASE:

Must be as manufactured for the Make / Model / Year. Minimum wheel base 108”. A one-inch tolerance may be allowed at the direction of the Technical Inspector for accident damage the day of the race.

 

 

Claim Rules:

CARBURETORS: The carburetor claim can only be done by the driver and can only do 3  claims per season.

 

$300 Carburetor claim and exchange of your carburetor for theirs.  

Must finish in the top 5 and make claim within 10 minutes of checkered flag.

The carburetor claim can only be done by the driver and can only do 3 carburetor claims per season. 

 

SHOCKS: - The shock claim can only be done by the driver and can only do 3 shock claims per season.

 

$400 shock claim on all four shocks and exchange of your shocks for theirs.  In order to claim you must have finished on lead lap and claim must be made to the tech man with cash in hand within 10 minutes of checkered flag.

 

Each driver can implement a shock or carburetor claim up to 3 times per season, but any car can be claimed against at any time during the season with no limits.

 

WHEELS AND TIRES:

8” steel wheels. 15x8 maximum wheel size.  Optional: Bead lock allowed on all 4 corners.  DOT approved passenger street radial tires.  DOT tires cannot be wider than 60 series.  No mud grip tires.  We will be running the American Racing tires. H500 Hoosier or the AR500 Hard or Extra Hard and any G60 tire as well as 8” asphalt pull offs.  8" towel city recaps allowed. Tires can be grooved and siped.

All tires must punch 50 at any time.

 

Anything not specified will revert back to stock.

 

If it is questionable, contact the track owners (Donald Parker (228-547-6823) – Hattiesburg Speedway); (George Mitchell (228-348-0007 – Mitchell’s Motorplex); (Billy Roberson (850-698-3776) – Deep South Speedway) before doing it.