Limited Stocks


SPECIAL NOTE:    If there are any questions about building a car, or if you need an explanation of a rule, contact your Class Rep.  His/Her job is to work with you.

JUST BECAUSE IT ISN’T IN THE RULES DOESN’T MAKE IT LEGAL !!!  IF THERE IS A QUESTION, ASK FIRST – SAVE YOURSELF TIME AND  $ MONEY $ !!! here.

The term “stock” as referred to in this section is defined as original equipment manufacturer (OEM).  Parts that are mass produced and sold for the use on any production automobile while remaining manufacturer to manufacturer are allowed.  With limits not to exceed what the manufacturer specification and limits are as produced in general production automobiles.  After-market parts are allowed, but are to remain of stock specifications and materials.

  1. ELIGIBLE CARS
    1. Cars for Limited Stock competition are American or Canadian manufactured body styles 1949 through the current year.
    2. No Trucks (including El Caminos and Rancheros) or convertibles will be allowed.
  2. WHEELBASE
    1. Minimum allowed is 108 inches.
  3. ENGINE
    1. There will be no cubic inch limit.
    2. Engine may be relocated but the center of the number one spark plug hole must not be positioned any further back than the center line of the LOWER ball joint.  No left or right movement of the engine is allowed and is to remain manufacturer to manufacturer, i.e. GM to GM, Ford to Ford, etc.
    3. The class reserves the right to impose the use of a restrictor plate on cars that are not legal.
  4. PISTONS AND RODS
    1. Cid stock to engine used (400 cid are allowed with flat top stock engine pistons).
    2. Any steel rod allowed, must be stock length and weight to engine used.
  5. VALVE TRAIN
    1. Camshaft:  Maximum lift of 0.550” as measured at the valve
    2. Lifters:  Stock
    3. Pushrods:  Optional.  (Guide plates are allowed.)
    4. Rockers:  Steel roller tip rockers allowed.  No roller fulcrum.
    5. Springs:  Stock
    6. Valves:  Stock
    7. Timing Chains:  Timing chains only, no gears or belts
    8. Girdles are allowed
  6. CRANKSHAFT
    1. No stroker engines, no modified crankshafts or shims allowed.
    2. Crankshaft may be ground to clean bearing surfaces and drilled to assist in oiling.
    3. Knifing on the crankshaft is not allowed.
    4. After-market crankshafts must meet stock specifications and weight.
  7. HEADS
    1. Heads are to remain stock (OEM), no aluminum allowed.
    2. Heads may be milled for truing only.  No angle milling allowed.
    3. Only heads produced for general automotive use are allowed.  No porting or polishing of heads or manifolds allowed, (except within 1” of manifold gasket surface to match to manifold).  Bowl blending is allowed within 1” (one inch) of the back of the valve to allow factory stock valve size.  This is to allow 2.02” valves to be installed in heads that came stock with 1.94” valves. Must be inspected by the class rep.
  8. CARBURETOR
    1. Only 2 or 4 barrel carburetor of stock or stock replacement are allowed.  Modifications to carburetors are not allowed.
    2. Secondary jetting kits are allowed.  Maximum of 800 cfm.
    3. The choke blades may be removed and manual operation of the secondaries is allowed.
    4. A throttle stop and minimum of 2 springs are required on linkage.
    5. NO HP MAIN BODIES
  9. INTAKE MANIFOLDS
    1. Stock cast iron or dual-plane aluminum allowed.  No modifying or machine work is allowed.
    2. A spacer of up to 1” thick may be used under the carburetor on cast iron intake only.  No spacer allowed on aluminum intake.
  10. EXHAUST MANIFOLDS
    1. Allowed.  Exhaust pipe is mandatory and must extend behind the driver.
    2. Must exit side, not underneath.
  11. HEADERS
    1. Headers optional, including under chassis and conventional crossovers with primary tube diameter of 1 ¾“ OD. and a 3 ½” collector maximum.
    2. No 180° style headers allowed.
  12. IGNITION
    1. Stock, or stock replacement.
  13. OILING SYSTEM
    1. Stock oil system only, except oil pickup tubes may be modified.
    2. Wet sumps only.
    3. Remote oil filters are allowed.
    4. Accumulators are allowed.
    5. Oil coolers optional.
  14. WEIGHT
    1. The minimum car weight is 3,100 pounds without the driver with a maximum of 55% left side weight.
    2. Weight must be met at all times.
    3. Weight may be added but must be securely fastened to prevent it from becoming dislodged.
    4. Weight must be within 40 lbs. on the first night of competition.
    5. Additional weight must be added to those cars that do not meet rules, as follows;
      1. 100 lbs for not meeting rear end rules
      2. 100 lbs for not meeting front end rules
      3. 100 lbs for not meeting engine rules
    6. The addition of weight does not make a car class legal.  Cars will need to be class legal for points and pay and will be limited to 3 races.
    7. Weight penalty does not apply for engine rule if a class-approved restrictor plate is used, and inspected randomly during the year.
  15. CLUTCH OR TORQUE CONVERTER
    1. Required.  Must remain stock.
    2. Machine work is permitted to eliminate warping or hard spots on face of flywheel only.
    3. No aluminum is allowed.
  16. TRANSMISSIONS
    1. Transmission must remain stock.
    2. Gutting the transmission or machining off of gear teeth is not allowed.
    3. All gears must be usable.
  17. REAR AXLE
    1. Any stock passenger car rear end differential is allowed and must be in stock location using stock mounting hardware.
    2. One pan-hard rod is allowed parallel to the rear axle.
    3. Welding of the spider gears, limited slip, mini-spools and posi-traction allowed.
    4. No traction bars, devices, or axle damper shock allowed.
    5. After-market axle shafts are optional.
    6. May use 9” full floater rear end as long as it is mounted in the stock location.
    7. Must use OEM calipers only.
    8. No gun-drilled axles.
    9. Must use steel center section and carrier.
  18. SUSPENSION
    1. Stock to frame used.
    2. Jacking and wedging devices are allowed.
  19. SWAY BARS
    1. Stock, may be adjusted.
  20. SPRINGS
    1. Optional.  Steel only.
  21. A-ARMS AND BUSHINGS
    1. Stock.  Polyurethane or steel bushings may be welded in.
    2. Cutting and/or welding of control arms is not allowed.  Exception; the upper control arm may be cut for clearance of the jacking bolts.  Cutting must be kept to a minimum.
    3. Upper mounts may be fabricated but not relocated.
    4. After market A-arms are allowed as long as they are non adjustable, mounted in the stock location using stock hardware and are equal length on both sides.
  22. REAR CONTROL ARMS
    1. Upper arms may be lengthened or shortened only.  (Non-adjustable).
  23. SPINDLES
    1. Stock OEM only.
  24. TIE RODS
    1. Stock, may be reinforced.
  25. HUBS
    1. Stock to axle or spindle.
  26. SHOCKS
    1. May be relocated, but only on shock at each wheel allowed.
    2. No air shocks or spring assisted shocks allowed.
    3. Ball joint end shocks are allowed.
  27. STEERING
    1. Steering gear must remain stock.
    2. Steering column must be collapsible.
    3. Secondary quick ratio boxes allowed.
    4. Steering Quickener allowed.
  28. WHEELS
    1. Maximum bead to bead measurement not to exceed 10”.
    2. Steel wheels only, minimum ½” lugs on all wheels with ½” minimum thread contact.
  29. BRAKES
    1. Brakes are required on all four wheels and must be in working condition at all times and capable of contacting either drum or rotor.
    2. Both brake drum and/or rotor and brake pads must be in serviceable condition and within manufacture’s minimum thickness requirements.
  30. TIRES
    1. 10 tire limit per car, per year.  Exceptions may be made if tires are destroyed other than wear.  Must be approved by class.
    2. Current tire is Towel City 12” recaps.  Hoosier 970 is optional.
  31. FUEL AND FUEL SYSTEM
    1. Fuel is pump gas or aviation fuel.  Racing fuel is optional.
    2. Fuel cells mandatory.
    3. Electric fuel pumps are allowed with oil pressure cutoff switch.
  32. FIREWALLS
    1. Firewall may be relocated.
    2. Construction material for firewalls is to be no thinner than 20 gauge steel or equivalent.
    3. Tunneling to be of equal material.
    4. All holes must be properly covered.
  33. FRAME OR UNI-BODY STRUCTURE
    1. Stock frames may be reinforced.
    2. Front clip must remain stock and in stock location.
    3. Rear section of frame may be manufactured but must remain as close to stock specification as possible.  (MUST BE CLASS APPROVED).
    4. Suspension points must remain stock and in stock location.  Exception; spring buckets may be cut for jacking devices.
  34. BODY
    1. Stock or stock appearing after-market bodies.
  35. BUMPERS
    1. Bumpers can be OEM or single tube type in stock location.
    2. Reinforcement must be hidden.
    3. Bumper straps are mandatory on both front and rear.
    4. Nose loops are allowed with dimensions not to exceed silhouette of the car body.  Hoops may be located only on the top of the bumper with no reinforcement to the frame.
  36. NERF BARS
    1. No external.