STREET STOCK RULES
A1 RACEWAY DIRT TRACK STREET STOCK RULES
Pearl River, Louisiana
A1RACEWAY.NET
NOTE: No one under the age of sixteen (16), is permitted in the Pits. An acceptable picture ID is required at the Pit Entrance for anyone appearing to be age twenty-five (25), or younger.
FYI
During the 2008 season we will be observing, seeking input and testing with Crate motors, weights, tires and spoilers. Our plan is to refine the rules to where you can use either your current steel block motor or use a Crate motor. With that being said UMP DIRTcar racing has every intention of growing this class and trying to make it better for everyone.
THE STATEMENT: Unless it came on a stock, mass produced vehicle, it is not legal unless specified here! If it came on a stock, mass produced vehicle and it is prohibited here, it is not legal! All dimensions are referenced as the car is raced. Your tire pressures, spring settings, etc. may put your car out of limits. No variances are allowed when/if the cars are checked/weighed going onto the track. Following the race, decisions on variances for accidents is at the discretion of the Tech Inspector(s).
CLASS
DIRT STREET STOCK
RELATIONSHIP TO OTHER CLASSES
These cars are primarily for serious hobbyist. They are allowed more suspension options and more powerful engines than Pure Stocks.
ELIGIBLE MAKES/MODELS
Any Chrysler, Ford, or GM model car that was/is mass-produced for the United States market. Check with the track before you build.
MATERIALS
No ceramic or carbon fiber parts are allowed.
RADIATOR:
One, mounted in front of the engine for the purpose(s) of cooling water and, optionally, to cool an automatic transmission.
ENGINE
LOCATION
Forward most spark plug must be in line with the two top ball joints. One half (1/2) inch tolerance for temporary frame damage. Must be repaired by the next race.
OPTION 1
Properly Sealed GM 602 Crate Motor in any make car. Three thousand (3,000) pound minimum car weight after the race.
OPTION 2
MAKE: Corporate engine must match the corporate frame, any year OK.
DISPLACEMENT: After race car weight must be nine (9) pounds per cubic inch.
Displacement must be displayed on each side of the hood facing outwards.
BLOCK: Stock based, steel, small block. Aftermarket steel small blocks OK with a fifty (50) pound weight penalty. Weight must be clearly marked, located forward of the bell housing and be removable for weighing.
CAM: Chain driven.
LIFTERS: Solid or hydraulic. No rollers or mushrooms. No ceramic.
PISTONS: Dished or flat. No dome.
RODS: Any.
HEADS: OEM style iron heads. Aftermarket iron heads OK. Roller rockers OK. Screw in studs OK. Guide plates OK. Stud girdles OK.
VALVES: Maximum of two valves per cylinder.
CARBURETOR: One (1) carb. Five hundred (500) cfm two barrel Holley 2300 series 4412 with stock, unaltered, throttle arm and butterflies. Choke plate may be removed. Choke housing must remain in place. Power valve may be removed/blocked off. The accelerator pump squirter may not extend into the area directly above the venturi (Tech purposes). Recommend epoxying the boosters for safety.
CARB CLAIM: Any car owner of a car in the Feature Race may claim the carburetor of any car finishing ahead of the claimers car in the Feature Race for three hundred ($300.00) dollars.
INTAKE MANIFOLD: Any OEM OK. Aftermarket steel or aluminum OK. Bus, marine, Australian, Brezinski, etc. OK. OK to drill the intake to mount on VORTEC heads.
CARB ADAPTER/SPACER: OK in any combination.
AIR FILTER HOUSING: No vacuum lines allowed between the air cleaner and the carburetor. Only one, round, mass produced air cleaner may be used. Maximum size of the element will be fourteen inches in diameter by four inches tall. Air cleaner top and bottom must be made of solid metal. NO PLASTIC AIR HATS.
IGNITION: Battery operated. OEM or after market. Distributor must be mounted in the stock location. No crank-triggered ignition. One ignition box OK.
ALTERNATOR: After market OK.
HARMONIC BALANCER: After market OK.
STARTER: Required. Aftermarket OK. Must drive the stock location ring gear. May be reverse mounted.
WATER PUMP & P/S PUMP: After market OK. Front mounted, belt driven.
FUEL PUMP: Stock location on the block. After market OK.
ACCESSORIES: Other items must be OEM style but may be after market items.
FUEL
Racing gasoline OK. No after market additives. No cool cans. See the Safety Rules for info on the required Fuel Cell.
EXHAUST
Headers OK. Must exit such as not to be aimed in the direction of the cockpit.
MUFFLERS
Schonfeld part # 112530 or # 112535 REQUIRED NO EXCEPTIONS. Tech man must be able to read numbers stamped on muffler.
FLYWHEEL/FLEX PLATE
Aftermarket OK. Racing OK.
CLUTCH/TORQUE CONVERTER
Aftermarket OK. Racing OK. The car must be able to be started in neutral and the engine run with no pedals or levers engaged.
TRANSMISSION
OEM style standard or an OEM style automatic. Coolers permitted for automatics. No internal clutch manual transmissions. No after market racing manual transmissions (TEX, Jerico, ...). The transmission must bolt directly to the rear of the engine block or motor plate. Must have at least two forward speeds and reverse in working order to take the track.
DRIVE SHAFT
OEM steel. Universal joints are to be similar in design to OEM units.
REAR END
Ford style nine inch including floaters OK in any make. OEM five or six lug OK after strongly considering installing C-clip eliminators or other provisions such that breaking a rear axle does not cause the axle to come out of the housing. The rear tread width can be no wider than the front tread width. The rear tread width offset can not extend beyond the front tread width on each respective side.
BRAKES
Minimum of two rear and one front brakes. OEM drum and/or disk setups on the axles. After market brake pedal and master cylinder OK. Cockpit adjustable brake biasing devices OK. Steel rotors and/or brake drums only. No ceramic or any other coating permitted on the surface of the rotors or brake drums. No floating brakes.
BATTERY
May use two batteries. If battery is located in drivers compartment must be in a enclosed marine box and securely fastened NO bungee cords or ratchet straps. NO EXCEPTIONS Must power the starter and the ignition and any accessories.
CHASSIS
OEM for Make/Model/Year of the body. May be notched or altered for wheel clearance. May be notched for fuel pump clearance if the area is reinforced appropriately. Safety roll cage required. Cockpit halo must be higher than the top of the drivers helmet and must include a diagonal brace.
WHEEL BASE
Must be as manufactured for the make/model/year. A one-inch tolerance may be allowed at the discretion of the Technical Inspector for accident damage the day of the race.
STEERING
OEM style for Make/Model. Quickener OK. No rack and pinions unless OEM equipped for year/Make/Model.
FRONT SUSPENSION
OEM style. A-arms should be reinforced while keeping their identity clear. OEM style and dimension racing shocks, springs, ball joints and steering components required. Shocks must use the OEM mounts and remain in their OEM location except the right front shock may be moved outboard to allow the use of a jack bolt on the spring. No other screw jacks allowed. For coil spring cars you may use up to five-inch springs. Chrysler torsion bar suspension is permitted if it was stock on the year and model designated for the car. No driver adjustable suspension devices permitted.
REAR SUSPENSION
OEM style. Stock suspension mounting points and approximate geometry must be retained if a Ford 9" rear is used. Heavy duty racing shocks required. Shocks must mount using the OEM ears/tangs and remain in their OEM location. No screw jacks. OEM style heavy duty racing springs required. Springs must remain in their reinforced stock mounts and location. For coil spring cars you may use up to five-inch springs. Chrysler torsion bar suspension is permitted if it was stock on the year and model designated for the car. Racing leaf spring setups in which the springs are securely fastened to the rear end are OK. No driver adjustable suspension devices permitted. No “Z” links, torque links, torque arms, damper shocks, fifth coils, etc.
TRACTION CONTROL
Other than listed under REAR SUSPENSION, no other traction devices are permitted.
BODY
OEM production body, 1960 or newer. Complete stock body, unaltered except as stated here. Hoods may be gutted. Firewall must be stock and in the stock location. Firewall may be altered for distributor clearance, if necessary. No open holes in firewall (seal penetrations). Maintain the stock floor from the firewall rearward to the rear edge of the seat. There must be a firewall between the drivers compartment and the trunk. All doors must be welded shut. Exterior door sheet metal my be replaced with fabricated sheet metal panels. Doors may be gutted. Install three (3) driver's side bars, with a 1/8" steel plate covering the door bars, front to rear and top to bottom welded in place on outside of bars. Install a minimum of two (2) right side bars. The frame rails do not count as the door bars. See the Safety Rules for other items. Front inner panels optional. Trunk lid may be gutted. All glass must be removed. No mirrors. Grill may be replaced with wire mesh. Must have stock body lines. Must have a metal firewall between the fuel cell and driver. No fuel lines in drivers compartment. Stop sign post material allowed between front and rear fenders on side of body to protect sheet metal and paint jobs. Fenders may be cut for tire clearance. Front fender wells may be removed. Rear fender wells must be sealed, homemade OK. The Technical Inspector may make allowances for race damage sustained on the day of the event.
NOSE/GRILL
Aftermarket plastic nose for Make/Model OK. Front grill may be removed if such nose is installed.
FRONT BUMPER
OEM for any make/model OK. Fabricated Late Model type front bumpers may be used if professionally built and properly installed. No sharp ends. Ends must be modified with tubing to produce a backward bend. Maximum bumper width is sixty-inches. May not extend more than three-inches outward from the attachment point of the last support/brace that attaches at a forty-five to ninety degree angle. One upper and one lower bar of no more than one-inch tubing no more than sixty-inches wide may be added to the bumper to support the nose piece. These bars may be no wider than the bumper and must have ends that curve backward and may curve upward or downward towards the bumper. Bumper ends must be smooth and rounded and stay within the body lines. All bumper material, mounts, braces and hardware must be steel and/or aluminum. Check with Tech the first time the car comes to the track.
HOOD
May have an opening for the air cleaner. The claimed engine size must be displayed on each side of the hood reading from the closest side of the car. Use letters at least three-inches tall with the length proportional to the height. Example: “355 ci” or “355 cubic inches”.
ROOF
Stock appearing. No spoilers or wings. The left and right edges of the roof are to be approximately the same height from the top of the doors and quarter panels. No more than a one inch tolerance. The left and right side support panels for the roof must be of the same design and front to back length.
INTERIOR
See the section on SAFETY.
The bottom of the seat may not extend rearward past the plane generated by connecting the rear most edges of the doors.
Aftermarket pedals OK. May be relocated.
No mirrors.
OEM size window openings required.
TRUNK LID
Required. Must be able to be opened.
REAR BUMPER
Any make/model OEM OK. Fabricated OK if approved by Tech. Ends must be smooth. Must be attached to the frame or roll cage in at least four places, two on each side of the centerline.
SPOILER
Maximum of seven (7) inches above the rear edge of the rear deck and no wider than the rear deck.
WHEELS
OPTION ONE: Steel, fifteen-inch diameter. Maximum width is twelve (12) inches.
OPTION TWO: Aluminum, fifteen-inch diameter, wide five. Maximum width is fourteen (14) inches.
ALL: Bead lock on the right rear only. Must mount using at least a five lug nut design. May race with no more than one stud per wheel missing IF it was broken that day at that event. Mud caps OK. Any mud cap that comes loose during a race, other than during an incident that causes a yellow or red flag, may be reclaimed by the driver for a five-dollar donation to the track rollover fund. If the loose mud cap is the reason for the flag, that car may be sent to the rear of all cars that were on the same lap prior to the caution.
TIRES
OPTION ONE: EC1's and/or EC2's on the twelve (12) inch steel wheels.
OPTION TWO: Dirt Late Model 55/56 tires on the fourteen (14) inch aluminum wheels. Must punch at least sixty (60) before and after each race.
ALL: Tires may not be chemically treated such as using tire softeners.
ELECTRONIC DEVICES
No radios, lights or other powered devices may be used to communicate with the driver. Pit boards are OK. No digital cockpit gages except working tachs. No on board computers except those contained within the ignition and/or tachometer systems. Rev limiters OK if not adjustable while racing and packaged with the one allowed ignition box..
WEIGHT
OPTION ONE: Properly Sealed GM 602 Crate Motor in any make car. Three thousand (3,000) pound minimum car weight after the race.
OPTION TWO: Corporate engine must match the corporate frame and weigh at least nine (9) pounds per cubic inch after the race.
ADDITIONS/CHANGES TO THE SAFETY EQUIPMENT RULES:
SCATTER SHIELD: All non heavy duty racing clutch assemblies/torque converters must be mounted inside of a safety steel bell housing. If not, the bell housing must have a scatter shield covering the upper 270 degrees of rotation using a minimum of a four-inch wide section of one-quarter-inch steel. The four-inch section must cover the flex plate/flywheel and the torque converter/coupler/clutch).
WINDOW NETS: Required. The latch, if latch type, goes to the top, front corner.
NOTE: No one under the age of sixteen (16), is permitted in the Pits. An acceptable picture ID is required at the Pit Entrance for anyone appearing to be age twenty-five (25), or younger.
