Street Stock Rules

1. Minimum 4-point roll cage mandatory, two points in front of the driver and two behind. Mandatory at least 4 door bars on left side, 3 door bars on right side.  Cage must be welded in a professional manner and is subject to approval by tech personnel. Driver side window net is mandatory.

2. Battery must be in a full closure box and be securely fastened in front of rear end or in drivers department. Master On/Off switch easily accessible from driver’s window.

3. A racing seat constructed of at least aluminum is mandatory. Seat must be secured. Must be fastened to the roll cage or frame structure. An onboard fire extinguisher is mandatory.

4. All safety belts must be mounted per manufacturers’ recommendations. The belts should be a minimum of a five-point harness and must be in good condition. Restraint system must be securely attached to roll cage structure.

5. Car must have a front and rear firewall between the driver, engine compartment, and fuel cell area. Fuel cell must be enclosed in a full steel can. Minimum height 10” from ground.

6. A made for racing fuel cell with foam is recommended. (maximum 22 gallons)  gasoline only, no additives. Fuel line must run through steel tubing if running through driver’s compartment.  If running under car must be securely fastened. All Cars must run 100 % Track Race Fuel or 100% Pump Gas No Mixing of  Gas or additives.



1. Any Car that stops on the race track to intentionally to bring out a caution will be penalized one lap. Participant must be at least 12 years of age. . Radios will be permitted for use

2. Car must be American made. Wheel base must be within 1″ of factory specs. Camaros, Novas and Firebirds will be allowed. Must retain stock rear leaf spring suspension. No Convertibles, Station Wagons, or Pick- ups. All interior must be removed. All holes must be patched in firewalls and floor pads. Third generation Camaro’s will be allowed. 4th Generation Camaros will be allowed but must run stock suspension and spring sizes.

3. 5″ Minimum Body and Chassis Height.

4. Bodies must be absolutely stock appearing, no chopping or lowering of bodies in any way.   Factory OEM roof must be used, No Fiberglass Roofs.  The top of the rear quarters must be OEM. Aftermarket OEM replacement front fenders and lower quarters may be used.   The hood, deck lid and doors may be aftermarket.  Rear deck must be securely fastened. No Current Aftermarket LM Body. All Bodies must be Tech Man approved. Non Approved Stock body is subject up to a 100# pound weight penalty or restrictor plate. If you think your body is marginal please text a picture to Ron at 843-496-4792 or email a picture to for a ruling before the race day. Any car that does not meet specifications will be required to add weight and/or restrictor plate. If car is too cheated up the street car will be allowed to race in another class at the speedway.

5. A maximum 5″ tall x 60″ wide spoiler will be allowed (300 max square inches). Factory spoilers size allowed.  A sealed hood scoop will be allowed. Rear tail must be enclosed with a stock appearing bumper cover.

6. Standard round air cleaner – no fresh air or induction systems allowed. No directing fresh air to the carburetor No flow control air cleaners allowed.  Front of hood must be securely fastened.

7.  3150 lbs minimum weight for 602 crate engines, 3200lbs for 603 crate engines and 3150lbs for “Built Engines” with driver after race, 55% left side maximum, no fuel, water or oils may be added after the race to any cars. Built Engines- Check out the street stock rules at or below when running a Built Engine.  All Cars Maximum 55%. Declared weights must be displayed on top left corner of windshield or back of hood.

8. Automatic transmissions with stock OEM type working torque converter, min. 10”. No lock ups Straight Drive Clutches and pressure plates must remain OEM stock. No lightening allowed. Clutch pressure plate, disc, flywheel, and flywheel bolts must weigh 33 lbs. minimum.

9.  Standard OEM production  transmissions 3 or 4 speeds will be allowed to compete. All gears must work. No overdrive gears allowed.  Must use a steel blow proof bell housing if using OEM stock type clutch. 7 ¼ or larger metallic clutch will be allowed with a 75lb weight penalty and may use an metal bell housing. Starting in May 15, 2015 weight will be increased to 100lbs. for 7 1/4 clutch etc. Starters must mount in stock location.  A hydraulic throw out bearing will be allowed.

10. Racing wheels only up to maximum 10”. NO softener or tire treatment of any kind.  Scuffed 10″  Hoosier Track Tire. The Series Track Tire will be Scuffed Hoosier P48 on Asphalt . The Scuff Tire Raced must be bought from the series or track that have been marked and the serial number recorded.  50 Lap  Races Must Buy 4 Qualifying Tires From Track Being Raced At! The Tires you qualify on must start the race and finish the race unless you have a flat tire. The flat tire replacement(s) will be approved before each race by the series at each race. There may be a 10 minute halfway break at each event  and it will be annouced prior to race night (Time Permitting). If there is a halfway break you will be allowed to make minor adjustment with no hard parts changed. The penalty for this is have to start at the rear of the field. 100 Lap $2000 To Win Races have a entry fee of $100. The 50 Lap $1000 To Win have a entry fee of $50. Tire Sets will be Equally Graded Track Scuffed Tires will be drawn and will cost $140 a set of 4. The Speedway will have a Tire Man at the track and the cost will be $5 a tire to mount on your wheels.Teams will be required to buy  Tires (Scuff) at the track that will be Series branded! The marked Qualifying set (as Sold in Sets) will be the tires you start the race on and may be impounded!  If you Change a flat you must install a Series Scuffed marked tire. If you have a Pit Stop you will be required to start at the tail end of the race field unless it is the halfway point.  Caution Laps do not count as you will not lose a lap on pit road but you will lose Track Position. There will Limited fuel on Pit Road with 1 electric wrench and 1 jack. There will be a 10 lap rule in effect where all lead lap cars proceed to the front of the field. You must start the race on the tires you qualified on! If there is a caution near the halfway break race control may use it for the halfway if being used.

11.  Frame must remain stock from front of steering box to rear halo cage bar. Frame must be same dimensions from front to back (length and width). Frame and cage may be reinforced by rectangle, square or round tubing for safety. Max rear weight percentage (50.0% Rear).  If  there is any car that has a excessive grandfathered shorter frame will be allowed to run with a rear weight percentage penalty determined by tech man. Lower A-frames and rear trailing arms must be in stock mounts and stock locations.  Upper A-frame mounts may be altered.  Tubular UPPER A-frames may be used.  Unaltered Lower A-Frames must remain stock OEM  and must be same length on Right Side and Left Side excluding Ball Joints and Bushings. Frame may be notched for fuel pump clearance.  Cars must retain stock OEM spec parts. (Lower A-frames, spindles, trailing arms, and steering components must remain stock OEM parts) Front hubs and rotors must be same size and in OEM location and not be lighter than OEM stock. A floater rear end will be allowed.  OEM Limited Slip, OEM Open, Locked Up Spool, or Detroit Locker Allowed. No Gleason or Gear Driven Devices allowed. No cambered rear ends allowed (max .4 degrees). No travel limiting devices on suspension. No rear gear rule. Cars must have a complete steel firewall and floor pans.  

12. Maximum tread width for front and rear of car measured from outside to inside of tires at spindle height is 67”. Effective May 15, 2015 Tread width will be decreased to 66.5″ etc   Front sway bars must be stock type only (Howe type) 1.370 max.  No rear sway bars allowed.

13. One steel shock per wheel, $119.99 max. cost, any shock determined to have a new price of more than $110 will NOT BE ALLOWED. Priced by 2014 Lefthander Racer Price, If it is not in the catalog go by racer retail price. No Coil Binding of Springs, Chassis or Bumpstops. No Travel Limiting Devices on Suspension

14.  Metal Driveshaft must be painted white with at least one driveshaft loop.

15.  Crate Engines: (see weight rules)  Chevrolet 602 or 603 crate engine OEM specs only will be allowed to compete with a 500 Holley. Headers allowed  No  rear gear rule. All engines are Subject to complete tear down or crate engine exchange after race. 602 Crate engine must weigh 3150lbs, 603 Crate engine must weigh 3200 lbs. All cars left side maximum 55%. No Gear Rule. All Engines are Subject to tear down after race.

• Crate Engine can be used as supplied from factory manufacturer. These engines are subject to teardown procedures and legalities determined by tech committee. The staff at Dillon Motor Speedway and MASS Series has invested a lot of time and money to be “up to date” on these engines, therefore make sure the engine is legal.
• Crate engines are designed to cut the cost of racing. Anyone found tampering with these
engines will be fined up to $1000.00 for each offense and loss of championship points.
• Crate Motor is a great application for Local Racing if the competitor will leave them alone. Run them as supplied from the factory to ensure legality. Any questions Contact Us
MASS Series Reserves the right to claim any Crate Engine that competes in the series. DMS and MASS Owner Ron Barfield can trade a new Crate Engine of the same part number for the one in the race car at the completion of an event at any MASS Event! If the Claim is denied the Car Owner will be subject to penalty and a fine!

16. Built Engines (Section 12): 3150lbs for base built engine allowed to compete with a 350 Holley. Headers allowed.  Contact Ron Barfield at 843-496-4792 if you have any questions on your built engine combination. We will Work With Your Combination.  
• Only standard production engines from manufacturer allowed. 350 cubic inch OEM stock
engine plus overbore. No high performance parts allowed unless listed below. Overbore
of .060 permitted. Any 6 cylinder engines contact speedway for requirements. 6 cylinder cars may compete but must weigh 2800lbs.  4 Cylinder Street Stock Body Cars will be allowed to compete by running the 4 Cylinder Mayhem Rules and weighing 1 pound per cc
• No polishing or coating any parts including inside of block. No electric fuel pumps
• OEM Stock or OEM replacement parts for OEM cubic inch including cylinder heads, pistons, crankshaft, and steel connecting rods only.
• Flat top or dish three ring pistons are permitted. Pistons may have min “two eyebrows”.
• Crankshaft with stock stroke must be retained. 50 lbs min weight.  No drilled rod or main journals. Crank journals may be ground for undersize bearings. No lightening or drilling. No other machine work will be permitted. Enlarged OEM oil pan permitted.
• OEM stock production steel heads only with OEM steel valve size and combustion required. • Piston must not extend above top of block.
• 305 and under cubic inch engines may use 500 Holley • Four bolt-main blocks permitted. Engine must be in Stock OEM location (which is in front of ball joints). Aftermarket pulleys allowed. Unaltered Edelebrock 2101 or steel intake allowed on built engine.
HEADS and CAMSHAFT(Section 12)
• Stock production steel heads only. No angle plug heads. Vortec heads allowed on DMS built engine with a max 1.357 spacer plate adapter with a no bevel. World Product Stock Replacement (SR) head will be allowed with a 100 pound penalty
• NO modifications, no porting or polishing. No grinding of any kind. Standard 3 angle valve job allowed.
• Chevrolet 70cc minimum; Ford (Clev) 68cc; Ford (Win) 58cc; Chrysler 68cc minimum.
• OEM valve size for cylinder head required. Steel valves required. Any Chev head with cc’s that are less than 70 or any valves bigger than 1.94/1.50 will be required to add a 100 pounds or 50 pounds for each. Tech Man may approve other combos with a weight penalty
• Cam and any lifters with a maximum lift of Chev .480, Ford .512, Dodge .500. Lift will be measured at the valve retainer as run in the race. Any Ratio Rocker to achieve max lift is ok! Any Cam that lifts under .450 or over .480 is eligible for a weight break or weight penalty at tech discretion.
• Stock OEM valve spring and retainers. Aftermarket rocker arms allowed. Poly- locks ok.
Studs may be pinned, screw-in studs and guide plates permitted. No stud girdles. Valves must be steel.
• Valve size maximum: Chevrolet 1.94 intake 1.50 exhaust
Ford Cleveland 2.05 intake 1.65 exhaust
Ford Windsor 1.89 intake 1.60 exhaust
Chrysler 1.90 intake 1.60 exhaust

Any engine that does not conform to the above engine rules may be able to add weight and/or restrictor plate to be able to race. Tech Mans decision is FINAL.


17. Exhaust must not be over three and half inches in diameter (max 3 1/2” diameters) that must exit from under car.  A HEI style distributor must be used and may be locked.  Coil and module must remain in distributor.  No traction controlled devices of any kind will be allowed

18. Water only, no antifreeze No electric fuel pumps.

19. Engine in stock location or most forward spark plug, no further back than the center line of the upper ball joints..

20. Crate Engines allowed with 500 Holley two barrel. Choke horn must remain, choke mechanism may be removed. One Non Adjustable aluminun carburetor spacer maximum thickness with gaskets of 1 ¼”. Carb Spacer must be straight cut with No Bevels. Carburetor must be unaltered. Air Cleaner base must not be above choke horn.

21. Built Engines allowed with a 350 Holley two barrel. Choke Horn must remain, choke mechanism may be removed. One Non Adjustable aluminum carburetor space maximum thickness with gaskets of 1 1/4″. Carb Spacer must be straight cut with No Bevels.  Carburetor must be unaltered.  Air cleaner base must not be above choke horn.

22. All body parts must be securely fastened.  Any body parts that appear to be loose or not securely fastened will be black-flagged

23. Any car that does not conform to any of the above rules may be required to add or lose weight and/or restrictor plate determined by the tech committee. MASS officials may use professional judgement for any infractions for a competitive race program.

24. Electronic scoring will be used.  A $20 transponder fee for the entire weekend. Must leave drivers licenses with ticket office that will be returned when transponder is turned in

25. Numbers can now be guaranteed for the race.  You may request your numbers immediately by sending your registration and fee. Numbers to be guaranteed will be first come, first serve.

26. No entry refunds. Promoter has the right to reject any entry or car from competing.   Rules are subject to change at officials’ discretions and weight penalties may be added for rule infractions.

27. Teams will be responsible for the cleaning of pit area. There will be a charge for leaving tires.

28. A finishing order will be posted at the tech area after post race inspections are completed.  Competitors will have 15 minutes after the posting to protest the finishing order.  After 15 minutes, the finishing order will be official and no changes will be made.


  1. Base weight 3150lbs and 3200lbs, 55% left side maximum checked after race.  No fuel, water, or oils may be added to any cars after the race. Designated weight must be declared on top left windshield.

            Base weight for 602 crate engines – 3150 lbs. 55% max left side weight

Base weight for 603 crate engines – 3200 lbs. 55% max left side weight

Base weight for “Built Engines”– 3150 lbs. 55% max left side weight


 Any Car that does not conform to any of the above rules may be required to add or lose weight and/or restrictor plate determined by the tech committee.  MASS Series  officials may use professional judgement for any infractions for a competitive race program. Tech mans Decision on a fair race program is final decision.


You are responsible for the weight of your car, make sure you understand the rules and make your car the correct weight for after the race.

We reserve the right to change or adjust the rules at any time to enhance competition and car counts.

Any questions on the MASS events contact Ron Barfield at 843-496-4792,  or Race Day MASS Tech Official Ronnie Barfield at 843-319-9797. MASS Series Officials Decisions are final.