front page slideshow

Street Stock Rules

Street Stock Rules

Last updated 1/16/17

Trail-way Speedway   2017 STREET STOCK RULES              

ANY CHANGES FROM LAST SEASON WILL BE IN BLUE, if you have any questions, please send them to before finishing your car.

1. COMPETING MODELS & WHEELBASE: Any North American or foreign-made production model with a minimum wheelbase of 101.0”. Turbo or rotary powered cars are not permitted. No front wheel drive cars are eligible.

A) Wheelbase: Must remain OEM stock for that make & model being used with no variance.

B) Strut-style cars: May be 101.0” if originally produced as OEM strut-style cars.

The following options are available for all OEM Strut-style cars:

            1) Must keep the struts on the car if it was originally delivered from the factory that way as OEM. The strut may be drilled out and a steel-bodied, non-adjustable shock may be added, remaining perpendicular to the strut. No “coil over” shocks are permitted unless as delivered as OEM stock. Must maintain the stock OEM wheelbase with no stretching or shortening permitted.         OR

            2) The front subframe may be replaced with any passenger car subframe from the same make (i.e. Ford for Ford and Chevrolet for Chevrolet). Truck or 4x4 subframes are not permitted. Must use a frame of 8.0" in circumference (2.0” x 2.0” box tubing) to tie front and rear frame rails together. Roll cage must be attached to the box tubing frame. Minimum tubing size is 1.5” o.d. If this option is used, then the wheelbase must be a minimum of 103.0” wheelbase. This may be done by adding a section to the floorpan. The body must be altered to fit the frame in a similar manner. The engine must remain in the original location.

2. BALLAST: All added ballast must be painted white with the car number marked on each piece. The weight must be visible to the technical inspector upon inspection (i.e. nothing permitted in the frame rails).

Mounting Ballast: The blocks must be securely mounted to the frame using a minimum of two-(2) 0.5” or larger bolts. Ballast may not be placed anywhere within the driver’s compartment, on the firewall, in the fuel cell, etc. The mounting of the ballast is subject to the final approval of the technical inspector. No ballast is permitted above the deck level.

3. FRAME and ROLL CAGE: The following measurements are minimums. Only those areas indicated will be subject to technical inspections. The top of the roll cage must be constructed high enough to cover the driver's head. No aluminum and/or soft metals are permitted.

A) Must be a minimum of a four-post roll cage (6-point is recommended). Two bars may pass through the front and rear firewalls. The two rear bars must be tied into the frame and not the bumper.

B) Front and rear hoop are recommended and must be welded to the OEM stock frame, not the floor or body.

C) The roll cage and door bars must be constructed of round steel of minimum 1.5” diameter tubing (minimum 0.095” wall thickness). A minimum of (3) horizontal door bars are required on driver side.

D) A front and rear driveshaft hoop is mandatory.

E) A fuel cell protection bar is mandatory.

F) Radiator Support Bars: Only one horizontal loop bar is permitted in front of the radiator and one support bar may be installed between the two front frame rails. This bar may also be installed in front of the radiator. Vertical bars may be installed between the two horizontal bars for the sole purpose of protecting the radiator. This bar may be tied into the main roll cage.

G) Uni-body Cars: Must use a frame of 8" in circumference (2” x 2” box tubing) to tie front and rear frame rails together. Roll cage must be attached to the box tubing frame. Minimum tubing size is 1 ½” o.d.

H) Engine Location & Mounts: The engine must remain in the stock location and configurations as currently delivered by OEM. Chains are permitted from the engine to the frame in case of engine mount failure. Any solid motor mounts are permitted. Front or rear engine mounting plates are not permitted.

4. BODY: The body must remain factory OEM stock or aftermarket/handmade metal. Floorboards (we understand rust areas may be patched).The body, firewall mounts and body mounts must be OEM stock in stock location on frame. Before purchasing aftermarket body call speedway office for approval.

BODY PANELS: aftermarket/handmade body panels are permitted, can be made of aluminum or steel, and must have all OEM factory body lines, curves and shapes. Flat side or flat panels are not permitted. No semi-late looking bodies.

A) All cars must have a complete body in the proper configuration for the make, model and year, including fenders, bumpers, roof, nosepiece, hoods and trunks. Front inner wells may be removed. The rubber grommets may be removed from the body mounts.

B) All OEM factory trunk and hood latches must be removed and replaced with straps, pins, or clips. Track personnel must have easy access to open the hood and trunk quickly.

C) Chopping, channeling or modifying is not permitted including the roof post.

D) Exterior: All headlights, taillights and emblems must be removed. Doors must be welded or bolted shut. All sheet metal used must be 22 gauge or thicker.

E) Interior: All flammable (plastic or fabric) material must be removed. Dash assembly is optional. The rear firewall area must be covered with sheet metal when removing the rear seat. Sheet metal work is not permitted in the driver's area from the dash to the rear of the seat. The interior sheet metal may not be boxed around the driver's seat.

F) Firewall: A metal front firewall is mandatory between the driver’s compartment and the engine. A firewall is mandatory between the driver’s compartment and rear end/fuel cell compartment. Holes in the front and rear firewalls must be completely covered with sheet metal. The trunk must be sealed completely from the driver’s compartment.

G) Inner Supports: All body parts that may have the inner supports removed however, it must be braced to be rigid if the inner support panel is removed. The rear window side panels, dash board and the inner roof panels may be removed completely for roll cage installation only.

H) Bumpers: Both front and rear must remain stock OEM unless as noted below. Stock bumper brackets may be welded. No sharp edges (and stay within the confines of the car body). Chains or cable to secure the bumpers are also highly recommended. Non-visible reinforcing pipe can be used behind bumper, but it must be securely fastened to the frame. All cars must have a chain on the front and rear mounted to frame or designated roll bar for tow truck hook up

    1) Front Bumper– An aftermarket front bumper may not extend more than three inches from the outside of frame rails or the ends must be rounded/radiused and directed towards the rear of the car.

     2) Rear BumperAn aftermarket rear bumper may not extend more than three inches from the outside of frame rails or the ends must be rounded/radiused and directed towards the front of the car.

I) Nosepiece: Aftermarket plastic nose and tail covers may be used but must match car (GM on GM, Ford on Ford etc). You must have a bumper mountedbehind the nose and tail covers. If the nose or tail cover is removed during the race and there is no approved-bumper behind the cover, the car will not be permitted to continue in the race.

J) Rub Rails: Permitted between the wheelbase only. A maximum 1.75" max round tube or 3.00" x 0.25" max flat steel welded to body. It may be no lower than the center of the hubs and no higher than the top of the tire. Must be tight against the body with no sharp ends. Must be a single rail design and be attached flush with the body contours. At a distance of 18.0” from the rear wheel well, the rub rail may extend out from body to the outer edge of rear tire. Subject to the Technical Inspector inspection and approval.

K) Grills: The original grill may be removed and expanded metal or screen may be installed.

L) Spoiler: OEM spoilers as originally equipped on that make and model car. Aftermarket spoilers may be used as long as it resembles original design and height.

5. BODY STYLES: The following body styles may be adapted to currently approved chassis, must remain in manufacturer’s line.

A) Ford– Ford, Chevy – Chevy, etc.

B) Approved aftermarket body panelspermitted as follows: An aftermarket body may only be used on the same chassis as the stock body can be steel or aluminum. Cars must have rear body panel. The replacement body must be stock appearing. Before purchasing contact tech man.

6. WINDSHIELDS/WINDOW OPENINGS: All cars must have an approved protection in front of the driver in the windshield opening with a minimum of three-(3) vertical bars (no less than 3/16” in diameter). A screen for protection is also highly recommended. All glass must be removed.

Window Nets: Full size window nets are mandatory at all times in the left side window. The seat belt buckle method of mounting is recommended. Window nets must release from the top and be attached to the roll bars only. The side window areas must remain open at all times other than window nets. “Sprint car style window nets” are not approved in place of a full size window net.

7. SEATS: Only factory-manufactured  racing seats may be used. No homemade seats will be permitted. Lumbar supports and head & shoulder supports on the seat are highly recommended.

A) Mounting of the Seat: Driver's seat may be no farther back than 56 inches measured from where the floor pan meets the firewall from OEM factory to the back of the seat cushion area. The seat may be moved within the driver’s compartment (remaining within the same general area as the general design) without moving or changing existing bars in the frame. The seat must be mounted directly to the frame. When mounting the seat forward, use a flat piece of steel or aluminum behind the seat (don’t just use bolts in encased tubing). The use of wood as supports or mounting brackets is not permitted. The presiding tech inspector shall have final approval of the mounting of the seat.

B) Safety Harness: All cars must have a factory type of five-(5) point racing harness (minimum 3” wide) that is equipped with a quick release buckle unless otherwise designated. Be sure to regularly check your safety belts for damage such as fraying, tearing, etc. If this should occur, the safety belts should be replaced immediately.

8. HEIM JOINTS: Only steel heim joints are permitted.

9. SPINDLES: Must be stock OEM style spindles with stock dimensions and materials only. Aftermarket spindles are not permitted.

10. STEERING COMPONENTS: The entire steering system must remain stock OEM “type”, within the stock dimensions, steel thickness, location and configurations as currently delivered OEM for that make and model of car. Removable steering wheels and collapsible steering shafts are permitted to take the place of stock “OEM” type. Steering quickners are permitted.

11. SUSPENSION: All suspension must be OEM stock components for that make and model ofvehicle, except for rules noted elsewhere. Stabilizer links may be threaded rod. All bushings may be rubber, polyurethane, solid or spherical bearing type. Weight jacks are permitted in the rear only. If the car has front weight jacks a, then you must do 1 of the 2 changes listed below.

1. The threaded rod must be removed from the weight jack. OR

2. Keep the threaded rod, but must be welded so there can be no adjustments.

A) Front Upper Control Armsmay be tubular and must be non-adjustable.

B) Springs: Front or rear springs may be altered or exchanged as long as they are OEM or OEM type for that make of vehicle. Aftermarket racing type springs are permitted. Adjustable or fixed length spring spacers are permitted.

C) Shocks: Heavy-duty stock aftermarket steel shocks allowed. External canister gas shocks are not permitted. Front shocks may be mounted anywhere, top or bottom. Rear shocks must remain in stock OEM mounts on bottom, top of rear shock may be mounted anywhere.

12. DRIVELINE/TRANSMISSION: The entire driveline and transmission system must remain stock OEM, within the stock dimensions, steel thickness, location and configurations as currently delivered OEM for that make and model of car. Automatic or manual transmission is permitted if it was delivered with that make and model of car. Reverse gear must be working. Automatics must use a working stock appearing torque converter.

A) Driveshaft: The driveshaft must be one piece in design. The U-joints and driveshaft must be steel or aluminum only and within the stock OEM dimensions. The driveshaft must be painted white. Carbon fiber or any other type of exotic lightweight metal driveshaft, flanges and u-joints are not permitted.

B) Driveshaft Retainers: Must have at least one-(1) 360 degree driveshaft hoop (minimum 0.25” thick and 2.0” wide). The design of the driveshaft retainer will be the sole discretion and responsibility of the driver and the tech inspector may prohibit a car from competing in which he/she feels the driveshaft is not properly retained.

13. REAR ENDS: Stock OEM rear ends, axles and gear for that make of car. Rear ends may be locked by welding the spider gears or with a mini spool. Positive-traction as an OEM factory option is permitted. Any gear ratio is permitted. Aftermarket solid steel axles are permitted (gun drilled axles are not permitted).After market racing axles are recommended and Ford 9 inch rears are allowed. No floater rears allowed.

A) Upper Rear Control Arms: Aftermarket upper rear control arms are permitted but must be stock-OEM length and nonadjustable. All four-(4) upper and lower control arms must be connected at all times. Both upper rear control arms must be bolted to the frame and rear end on the stock OEM mounts. When using an 8.5” ring gear rear end in any of the metric chassis cars (i.e. Malibu, Grand Prix, Monte Carlo, etc.) the upper control arm on the rear may be shortened a maximum of 1.0” and the hole may be re-drilled. All four upper and lower rear control arms must be connected at all times EXCEPT as listed below in rule 16c. 

B) Camaro Cars Only: The third link must be mounted on top of the rearend, unless you are using factory set up (factory set up must remain mounted in the stock OEM location on the rearend and must have safety loop).Panhard bars must be stock length, permanently mounted (unable to adjust, and no visible adjustable holes) in factory location.

C) Coil Spring Cars Only– May run a three-link suspension only by removing one of the rear upper control arms.

14. BRAKES: The entire brake system must remain stock OEM “type”, within the stock dimensions, steel thickness, location and configurations as currently delivered OEM for that make, model and year of car unless specified below.

a) Brake Rotors: Aftermarket steel rotors are permitted on the rear. Front rotors must be stock OEM style.

b) Brake Calipers: OEM only brake caliper is permitted. Aftermarket brake pads are permitted.

c) Brake Lines: Steel, aluminum, rubber or steel-braided brake lines are permitted. Plastic is not permitted.

d) Brake Master Cylinder: Aftermarket brake master cylinders are permitted.

e) Brake Bias or Proportioning Valves: Brake bias or proportioning valves that are  in the cockpit must be out of reach of driver and secured so cannot be adjusted during racing. 

f) Rear Disc Brakes: Will be permitted as follows: Stock steel calipers must remain in manufacturer’ line (no aftermarket racing calipers). The caliper mount must be permanently fixed to the axle housing. Steel rotor only and may be aftermarket. An aftermarket aluminum hat is permitted.

15. WHEELS: Any type of automotive steel wheel that has a maximum 8.0” width is permitted (see tire rule also). Racing-type steel wheels are permitted. Aluminum, magnesium or other material is not permitted. The diameter and offset may vary. Reinforcing of wheels is permitted with plating, washers or double nuts. Heavy-duty wheel studs and lug nuts are highly

recommended. Bead locks are permitted on any wheel.

a) Wheel Covers - Metal or plastic wheel covers are not permitted. Foam mud plugs permitted.

16. TIRES: Any DOT-approved steel belted radial tire for street use only may be used (up to 60 series no 70 series tires are permitted). Bias ply tires are not permitted. No low profile, slicks, recaps, snow, racing, or studded tires. Re-grooving permitted

17. FUEL CELL: Any approved metal fuel tanks must be used and remain securely mounted in the rear compartment of the car or in the trunk. The fuel cell may not be any lower than the rear end housing and must be centered. Must have a fuel shut off valve within 12 inches of cell.

a) Fuel Pump: Electric fuel pumps are not permitted unless OEM stock for that make or model of car. Electric fuel pumps must shut off with the ignition.

19. RADIOS: One-way or two-way communication radios are not permitted with the exception of the mandatory working track Raceiver radio on the track designated frequency only (Frequency .0183).

20. TRACTION CONTROL DEVICES: No electronic or computerized wheel spin/traction control devices are permitted. Any driver caught using these devices will be suspended for a minimum of one-(1) year.


1. ENGINES PERMITTED: Engines limited to 365.0 cubic inches and must be in the chassis originally catalogues by manufacturer. All factory identification numbers and/or part numbers must remain on crank and heads. The combination of the rods, block and crankshaft used must be in the same combination that factory originally manufactured (i.e. Chevrolet components only with Chevrolet components and Ford components only with Ford components). All factory identification numbers and/or part numbers must remain on crank and heads and be visible. The use of titanium for rods, rod caps, crankshafts or headers is strictly prohibited. Needle bearing camshafts, crankshafts and rod bearings are not permitted. Must leave factory numbers on block and heads.

2. ENGINE BLOCK: The engine block must be an OEM standard production block. No aftermarket or aluminum blocks. Only two-(2) valves per spark plug are permitted. Turbine-driven, big blocks, turbos, blowers, superchargers or offset engines are not permitted. Computer operated or controlled parts are not permitted. Main bearing cap must be iron or steel. The lifter bore must remain stock.

3. INTAKE MANIFOLD:  Duel plain, no air gap intakes only. Porting or polishing of any intake manifold is prohibited (must remain unaltered and untouched).

4. CYLINDER HEADS: No high performance heads are permitted. Heads must include OEM stock casting marks. No porting, polishing or grinding is permitted except for port matching. Rocker arm studs may be pinned. Screw -in studs are permitted up to 7/16. Roller rockers are permitted. Aluminum cylinder heads are not permitted.

a) All heads must have a minimum 60cc as originally delivered as OEM from the factory. The “cc” measurement of the intake runner of head must remain stock with the exception of matching port.

b) Matching ports in the intake port of head is permitted. The depth maximum for matching ports is 0.75”. The valve seat area may be cleaned up using a maximum 80 degree grinding stone.

c) Unless otherwise stated, any cylinder head with evidence of sanding, polishing, relieving, grinding, porting, angle milling, chemical treating, abrasive blasting to the original cast form, will be declared illegal and penalized. O-ringing the head gasket seal area is not permitted.

d) Combustion Chamber: The combustion chamber may not be altered in anyway.

e) Ported cylinder heads are illegal as only port matching will be permitted.

5. VALVES: Only steel or stainless OEM stock valve or aftermarket OEM production replacement valves are permitted. Any retainer permitted. Only stock valve guide angle is permitted. Relocating valve guides is not permitted. Anyvalve spring permitted, with valve spring installed height pressure cannot excede 125 p.s.i.

6. CRANKSHAFT: The crankshaft must be an OEM factory production or OEM stock dimension aftermarket cast iron or steel crankshaft. No swapping of crankshafts between manufacturers. The Ford SVO crankshaft number M6303-H351 is permitted. The MOPAR high performance crankshaft with part number P1420312 is permitted.

a) Polishing of any kind is not permitted. One throw on the crank must have no balancing holes in it. The minimum weight of the crankshaft must be 46.0 lbs.

b) Stroke: The stroke must remain OEM stock as currently delivered by OEM with the exception that it may turned a maximum of 0.040” under for the replacement of bearings. Offset grinding of the crankshafts is not permitted.

c) Harmonic Balancer: Aftermarket OEM stock “type” harmonic balancers are permitted.

7. RODS: An OEM production or aftermarket rod with OEM specifications from an engine used is permitted. The modification of rod length is prohibited. Rods may not be polished. No addition or removal of metal other than normal balancing is permitted. Titanium or other materials other than steel for rods are not permitted. Ford permitted to use 6.0” length rod with SVO crank.

8. PISTONS & RINGS: Only flat top pistons are permitted with all three piston rings in place. Zero deck piston may not extend above the block. The ring lances and lowers part (skirt) of the piston may not be altered from the original in any way. Gasporting the piston is not permitted. Floating wrist pins are permitted. Valve reliefs may be cut into the pistons.

9. CAMSHAFTS: Any hydraulic flat tappet camshaft or solid cam is permitted. No roller, mushroom or “slapper-type” cams. Double overhead cams are not permitted. 

Cam Bearings: Must remain as “stock” Babbitt type. Roller bearings are not permitted.

10. CARBURETORS: Holley 4412. No dual line double pumpers permitted. A stock Holley 4412 (500cfm), TW gauge legal may be used only with no alterations or modifications regardless of the rules addressed below. Only the choke plate on the Holley 4412 may be removed with all screw holes permanently sealed.NO 4 barrels, and the claiming price rule of $450.

a) No fuel injection is permitted for specific year, make and model if OEM stock.

b) Modifications or components to increase or restrict airflow to the carburetors (such as velocity stacks, heat deflector shields, internal modifications not listed above, etc.) are not permitted.

c) Carburetor Adapter: Only a one or two-piece aluminum or phenolic carburetor adapter (maximum 1.0” in height) may be installed between the intake manifold and carburetor. A one-piece gasket may be installed between the carburetor and adapter and between the intake manifold and adapter.

11. CLUTCH: If manual transmission is used, it must have an operational OEM stock style all-steel clutch and operational starter. Stock configuration clutch must have a full scatter shield of at least 1/4 inch thick steel or approved bell housing. A 2.0” x 3.0” inch inspection hole located 3.0” from the transmission mounting surface is mandatory for clutch inspection.

a) Clutch Master Cylinder: Aftermarket clutch master cylinders are permitted.

b) Clutch Lines: Rubber, steel or steel-braided clutch lines are permitted.

12. FLYWHEELS: Stock steel flywheels and flex plates only are permitted. No lightening is permitted. The fly wheel , clutch and disc assembly must weigh a minimum of 23.0 lbs.

13. RADIATOR: Any aftermarket aluminum or copper radiator is permitted. An electric fan with a shroud is permitted. The radiator must remain in the engine compartment.

14. IGNITION SYSTEM: All components of the ignition system must be OEM stock style. An aftermarket module is permitted. A Ford solenoid is permitted.

a) Ignition Switch: The ignition switch must be within easy reach of the driver and clearly marked.

b) Spark Plugs and Wiring: Any aftermarket type wiring may be used. The electrode of the spark plug must extend into the combustion chamber.

15. BATTERY: The battery must be securely mounted in either the engine compartment or in the driver’s or trunk compartment completely enclosed in a battery box. A battery shut-off switch is recommended and should be easily visible from outside the car and marked “on/off”. Any battery must be used and securely mounted between the frame rails.

16. EXHAUST SYSTEM: OEMstock exhaust, chassis type, or over-the-rail headers only permitted with collector designed to exit underthe car is permitted. Exhaust must extend beyond the firewall. Exhaust may not exit through the side of the car. Frame notching is not permitted! Header wrapping (tape) and ceramic coatings are permitted. “Up and over”/crossover, Tri-Y,or 180 degree headers are not permitted.


17. FUEL: Pump gasoline or racing fuel sold at track is permitted. All fuel must be of the same specifications, specific gravity, color, smell of gasoline only according to Federal Standards of Purity, Grade A or AA. No additives of any kind permitted. The track reserves the right to take specific samples of fuel at any time for testing purposes. Any additives/mixing detected in fuel may result in a disqualification, fine, suspension, loss of purse and loss of points or any combination thereof.

18. GAUGES: Only onboard gauges that record the following information are permitted - water temperature, lap timer, RPM, oil pressure, oil temperature and fuel pressure. Direct reading oil temperature, fuel pressure and oil pressure gauges must use steel braided lines, not plastic or rubber. Onboard telemetry systems are not permitted.