2019 Grand National Sportsman Rules * Denotes Changes for 2019


The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION OF OR COMPLIANCE WITH THESE RULES AND/OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator, or official.

The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.



2019 Grand National Sportsman Rules

ELIGIBLE MODELS (car bodies) 1960 or newer GM, AMC, Chrysler, Ford or U.S. manufactured auto, pickups or station wagons. No convertibles allowed.

  1. FRAMES 1978 to 1988 GM metric frames only. Frames must be X-ed; side rails must be plated where open. Front cross member may be notched and plated for fuel pump clearance only. Weight jacks or screw jacks allowed. Frame rails behind rear spring pockets may be cut and fabricated. Must have a minimum 108″ (+ or – 1/2″) wheel base. Upper control arm mount only may be notched for shock clearance. No other improvements allowed except to repair rusted or damaged areas. See diagram.
  2. ROLL CAGES Four-point roll cage constructed of 1 3/4″ x .095″ wall steel round tubing. One front and one rear cross brace, recommended height at 20″. The main hoop behind driver must be cross braced. Two passenger side and four driver side door bars, with driver side door bars slated and having two upright bars between each driver door bar. Wing window bars on drivers side mandatory; passenger side recommended. Foot protection bar (may be plated for added safety). Two front support bars must start at cross brace height at roll cage corners and extend forward to frame. Four rear support bars must extend to frame, two starting at the rear cross race at roll cage corners and two from the top corners of the rear cage hoop. See diagram. Halo bar must have one crossbar running either in front to back or diagonal made of 1-3/4″ X .095″ wall steel round tubing.
  3. DRIVERS COMPARTMENT High back aluminum racing seat is mandatory. Seat must be bolted in with six 3/8″ Grade 5 or Grade 8. Four bolts in the seat bottom and two in the seat back. A window net with buckle release mounted on the top left corner is required. All roll cages must provide a minimum of two inches of clearance measured from the top of the roll cage to the top of the driver’s helmet when driver is seated and strapped in driving position. The center of the steering wheel must be padded and all roll bars that the driver could contact must be adequately padded.
    1. * Production passenger car, stock or after market template/straight-up style steel, aluminum or plastics front fenders. Hood must be steel, aluminum or fiberglass and the back of the hood must be sealed down completely. Door panels and rear quarters to be stock or sheet metal or aluminum. Rear roof supports must have same size opening in both sides. No door handles, locks moldings, factory plastic or chrome accent pieces left on the stock panels. Factory or after market plastic nose and tail pieces are okay. Rear of car, fender to fender above bumper to be completely enclosed. Bumper cover must be sealed to rear deck and rear quarters. No venting of any type permitted. Rear quarters and sail panels must be the same configuration on both sides. Nose of car must look stock appearing and neat looking – no wedge type or late model noses. NO wedge type bodies. No holes in hood or hood scoops. Hood pins to be used in hood and trunk. Stainless steel windshield screen must be no less than .063″ for mesh larger than 1/2″ or no less than .035″ for 1/2″ or smaller mesh (no larger than 1″ mesh screen allowed) to cover entire opening with three upright braces top to bottom of  3/8″ or larger solid rod. Spoiler allowed on rear of trunk lid not to exceed 6 inches base to tip, and be no wider than 60 ½ inches if using spoiler end plates. Spoilers not using end plate may have a width not exceeding the rear fenders. Recommended the spoiler be made of clear polycarbonate. At some future date clear spoiler will be required. No sideboards, wicker bills, or any other air controlling devices. No fins, lips, rudders allowed. No forward facing solid spoiler braces other than the following: maximum of (3) – 1 inch wide strap style or 3/8” round, forward facing braces permitted. Two and one-half inch (2 1/2″) nonfunctional hood scoop allowed. No bars or straps on outside of front nose. RACERS – YOUR CAR MUST LOOK STOCK TO RACE. Spoiler end plates permitted. One on each end, per not to exceed the dimensions in the diagram. There must be a minimum of 3- inch gap between the end of the sail panel and the front of the spoiler end plate.

    2. Body parts must be neat and well painted. Car numbers must be painted a contrasting color and numbered between 00 and 99. Numbers must be painted on both sides and roof to face grandstand. Numbers must be at least 16″ high and 3″ wide. Numbers of legible size must also be placed on the front and rear of the car to aid in line-up.
    3. The car, at its widest point including rub rails, may not exceed 78″.
    4. Absolutely no air induction of any type allowed.
    5. No rear windows allowed for safety reasons.
    6. Hood must be in place and secured at all times to race.
    7. No Late Model style roof.
    1. American made production V-8 engine blocks only. Must be production cast iron block with standard external measurements in all respects with the exception of the permissible .060 over bore maximum. No aluminum, Bowtie, Rocket, SVO, ‘X’, or ‘R’ blocks allowed. No removing of identification numbers. No grinding or lightening.
    2. O.E.M. stock production crankshafts with I.D. numbers intact or O.E.M. replacement (minimum 48 pounds). No light weight cranks. No knife edging. No offset grinding. No undercut counter weights. No drilled centers on bearing journals.
    3. Forged connecting rods only. Must remain stock length for the block being used (except 400 Chevy may use 5.7 rod). No titanium or aluminum rods. H beam allowed.
    4. Any flat top or reverse dome piston may be used as long as it has the stock wrist pin height for the engine being used (except 400 Chevy). Valve relief may be cut into the piston. No portion of the piston may protrude above the top of the block.
    5. Any Hydraulic or flat tappet steel camshaft with a maximum of .500 lift measured at the retainer. Stock diameter tappets only. No mushroom or roller tappets allowed. No stud girdles or rev kits. Standard timing chain only – no gear drive or belt drives will be allowed. Roller rockers and roller tipped rockers allowed. No shaft rockers.
    6. Cylinder heads must be stock steel production or World Products S.R. #’s 4266B, 4267B, 4360 or 4361, or Sportsman II heads #’s 1115, 1125, 1215 or 1225. If using Sportsman II heads you will be allowed no more than 11.00 to 1 compression ratio. No Bowtie, fuel injection type, SVO, W2, GT 40 or after market heads allowed.

      (141 will allow the use of GM Vortec steel heads with casting numbers 10239906 and 12558062. There will be no sanding, polishing, relieving, grinding, porting, chemical treating, abrasive blasting to any part of the head with the exception of machining to the valve spring pocket to relieve spring bind and the shortening of the valve guide to allow for valve lift. The addition or removal of material to the ports or combustion chambers or any alteration to the original form will not be allowed. The valves must remain 1.50 inch exhaust and 1.94 inch intake and at the stock 23 degree angle. The only intake manifolds that will be allowed to be used with the Vortec heads will be unaltered Edelbrock part numbers 2716, 2913 and 7516 no exception!)

Only two valves and one spark plug per cylinder. No titanium parts in the valve train allowed. Intake and exhaust ports must be in the original “as cast” configuration. Any evidence of any sanding, polishing, relieving, grinding, porting, chemical treating, abrasive blasting, alteration to the original form or the addition of material to the ports or combustion chambers is strictly forbidden. No external sanding, grinding or removal of I.D. numbers or symbols. Valves must be stock production size and in stock location. Small block Chevy maximum valve size is 2.02” intake and 1.60” exhaust, measured across the face of the valve. Stock production valve spring diameter for heads used only. Screw in studs and guide plates allowed. No chemical or ceramic work allowed in internal areas of intake or heads. Standard cylinder head reconditioning procedures are ok, including head surfacing to correct warping, valve guide reconditioning, and valve seat reconditioning. All repair work done on valve seats must not extend more than 1/4″ away from the valve seat.

    1. Oil pump must remain in stock location. No dry sumps or external oil pumps allowed. After market oil pans and breathers are allowed. Oil cooler, if used, to be in engine compartment only.
    2. Stock production cast iron intakes on engines over 365 cubic inch. Following aluminum intakes numbers allowed on 365 cubic inch or less – GM: Victor Jr 2975 or 2972 and 2101, Weiand 7546 or 7547. Ford: 2981 or 2760 and 2665 or 2750, Cleveland 7516 or 7517. AMC: 2930 or 2035. Chrysler: 2915 or 2176. Edelbrock: 7101 and 7501. After market or stock intakes to remain untouched. NO Marine type intakes.
    3. Stock cast iron exhaust manifolds or inexpensive headers okay. No 180 degree headers or step headers. Exhaust must exit under car, behind driver and be angled down. Mufflers are mandatory and car must pass noise level test (95 decibel at 50 feet) Recommended mufflers are Dynomax Bullet 24216 or Flomaster 50 Series.
    4. Factory type ignition, no Multi-spark discharge or mags. Rev limiters allowed, one chip system only.
    5. One (two or four barrel) carburetor only with maximum spacer height of 1 1/4″. Two return springs mandatory. No throttle cables allowed, must be mechanical linkage. Toe strap on gas pedal required.
    6. Stock cast iron or after market aluminum water pump.
    7. One radiator stock brass or aluminum in front of motor. Metal Shroud to cover top 180 degrees of fan. No electric fans. Absolutely no anti-freeze in radiator. Two-quart overflow can mandatory.
    8. Mini-Starter allowed. No reverse mounted starter. Must be able to start car.
    9. Engine must be centered between frame rails. Engine Set-Back to be measured as 33 1\2” from top steering box mounting bolt to rear of engine and 15 1\2” from steering box mounting bolt to #1 cylinder spark plug. Crankshaft centerline can be no less than 7 1/2″ from bottom of front cross member.
    10. No traction control devices allowed.
    11. A 1″ inspection window recommended in the oil pan (effective in 2009).The window should be located on the left side of the oil pan between the number 5 and number 7 rod journals. If there is no 1″ window and an inspection of the engine is necessary, you will be required to remove the oil pan or drain the oil so access can be gained through the drain hole.
    1. Steel blow proof bell housing only. Upper 270 degrees of bell housing must remain in tact.
    2. Flywheel to be stock or after market aluminum. No cut down stock flywheels allowed.
    3. 7- 1/4″ minimum diameter, steel or aluminum, single or multi disc clutches allowed. No spoke type flex plates allowed. OEM or OEM replacement flex plates only.
    4. US manufactured passenger car or light truck three or four speed unaltered manual or automatic transmission. The following after market transmissions allowed: Brin part# BR170001, Falcon part # WIN60100, Bert part # BERLMZ, Racegator part# 140002. If automatic, must use stock torque converter.
    5. Drive shaft to be steel, painted white, and have safety loop of minimum 1″ X 1/8″ thickness located within one foot of front U-joint.
    6. * Stock rear end for frame used or Ford 9″ floater recommended. Any combination okay so long as parts are steel. No aluminum parts except drive plates and spools. No off set. Drive flanges to be of equal distance on both sides of frame. No independent rear end (Corvette, Jaquar). Rear trailing arms must remain mounted in stock frame locations. One hole upper and lower for each trailing arm mount location, multiple hole trailing arm brackets allowed on rear end only. Brackets must be uniform in their distance from the center of the housing. No after market limited slip or ratchet style rear ends. (Example: Gold Track, True Track or Gleason, etc.)
    7. No gun drilled axles.
    1. Steering wheel to be quick release style.
    2. Stock steering box and linkage only. Steering quickner allowed. Steering shaft must have 2 U-joints or be collapsible style.
    3. Stock intermediate metric lower “A” arms only. Stock unaltered intermediate metric spindles and rotors except for wheel bolt pattern and hole for outer tie-rod end. No dropped spindles. IMCA stamped 3 piece after market spindles are allowed. Part number 91034501 -L and 91034501-R only. Replacement arm # 34503 L & R, brake mount # 34504. One steel unaltered shock per wheel at any mounting position. No externally adjustable, coil over, air or remote reservoir shocks. No Schroeder or gas refill ports. No coil over eliminators. A Coleman hub may be used on the front only.
    4. All A-frame, trailing arms, steering components and suspension mountings must remain stock for frame, in factory frame position. Outer tie-rods ends may be replaced by 0.625 or larger steel heim joint with a solid (no seam) steel adjuster sleeves and jam nut only. Rear trailing arms may be aftermarket. Must be stock length and use bushings. No heims, mono balls or adjustable. Length measured center to center, upper 11-1/8″, lower 19-1/4″, one solid piece. Must be same measurement side to side.
    5. Stock dimension intermediate metric ball joints only.
    6. Any O.E.M. type sway bar permitted.
    7. Front upper control arm may be replaced with complete steel tubular drop in replacement, one-piece control arm of stock length (8”), plus or minus “ ½” of stock length using stock ball joints. No aluminum components allowed.
    8. * Rubber Bushing Replacement – Stock or plastic and grease-able bushings allowed. NO OFFSET, BEARING TYPE, MONO BALL, OR MID EVIL BUSHINGS ALLOWED.
  3. BRAKES Four wheel foot operated hydraulic brakes in working order. Dual master cylinder allowed. Limiting or proportioning valves okay. GM Metric frames must use unaltered GM Metric calipers only. No aluminum, after market caliper replacements.
    1. Pump gas only including E85.
    2. Approved fuel cell to be enclosed in 22 gauge sheet metal with 2 straps in both directions. Straps to be 1″ X 1/8″ steel. Ground clearance of 10″. Fuel cell protection bar on the bottom (as low as fuel cell). Minimum of 1 1/2″ X .065 wall square tubing fuel cell hoop with two or more braces to frame. (One on each side of the fuel cell.) Fuel cell to be filled from top and have approved cap. No fuel lines in driver area.
    3. Stock style fuel pump in stock location. No electric or belt drive pumps.
    4. No bottom draw fuel cells. Outlet must be on top.
    5. The fuel cell breather or vent must have a one-way check valve to prevent spillage in case of a rollover.
    1. Stock bumpers may be reinforced, ends must be strapped to fenders. Must have both bumpers to race. Radiator protection bar may be no higher than the front of the hood or exceed 8” above the frame rail and no wider than the frame rails and may not extend beyond the front of the bumper. Trunk protection bar no higher than rear of trunk lid. Protection bars to be 1 3/4″ X .095 wall round tubing or smaller. Side protection bars to be no larger than 1″ X 0.095 wall square tubing with the ends capped at 45-degree angle.
    2. All cars must have a loop, hook or other provision in the centerline of the front and back, behind the bumper line for the wrecker to hook on to.
    1. Racing steel wheels of 8″ maximum width. Bead locks are allowed on all wheels.
    2. 1″ hex steel lug nut mandatory. Studs must pass through lug nut completely.
    3. RC4 tires . No grooving, siping or softening allowed.
    4. Check with Durometer or sniffer (100 parts per million maximum)
    5. * Racing steel wheels of 8 inch maximum width. Bead locks allowed on all wheels. Foam type, aluminum, or plastic disk mud plug allowed. Plastic and aluminum disk mud plugs must have car number. Plastic or aluminum mud plugs must be attached using magnetic steel, bolt on style mounting hardware. No dzus mounting of plastic or aluminum mud plugs allowed.  Mounting tabs must be integral to or welded to the wheel. Wheel covers must match wheel manufacturer. Example: Aero Wheels must use Aero Wheel Covers.
    12 volt electrical system only. One 12-volt battery only, which must be located behind driver area and securely fastened. On/off and start switch to be clearly marked in driver area and easily reached by driver and safety crew. It is recommended to have a main battery kill switch located behind the driver.
    Weights to be bolted securely, (bolts must pass through frame, minimum 1/2″ bolts) and painted white with car number and division on each weight. Loss of weight during a race will disqualify driver from race. No weights in driver’s compartment allowed.
    Absolutely no mirrors allowed.
    Listed under 141 Track Rules.
    Stock Cars must run their rules with the exception of using Hoosier “E-MOD RC-4” tires. There is a 4-week limitation on this rule. If the car runs more than 4 weeks, it must meet Grand National rules.  
    Eastern Wisconsin Street Stocks may run in the Grand National division and must meet Eastern Wisconsin Street Stock rules. (No minimum weight).
  13. OTHER
    Drivers must be at least 16 years of age. 14 and 15 year olds may race with prior approval from 141 Office and 141 Insurance Company.
    Transponder must be placed 24″ or more, behind the center line of the rear axle to the forward edge of the transponder, on the right side frame rail.


  1. Wing window bars (mandatory)
  2. Wheel base (108″ minimum)
  3. Mandatory safety plating (1/2″ steel minimum)
  4. Stock frame this point forward
  5. Rear frame tail section (2: x 3: x .095 wall steel tubing)
  6. Fuel cell can (mandatory) (Material: 20 gauge steel)
  7. Foot area protection bar (mandatory)
  8. Dark shaded bars may be .065 1-1/2″ K.065 min.
  9. All cages must have these front & rear support hoops/bars
  10. Braced .065 fuel cell guard
  1. Approved racing window net (mandatory)
  2. Recommended door/bar length 44″
  3. 2, door/bar uprights between each door/bar (mandatory)
  4. 4, door/bars evenly spaced on driver’s side (mandatory) **Note** All driver’s side door/bar material minimum 1-3/4″ x .095″


  1. Frame plating material (4″ x 1/8″) flat strip steel
  2. Roll cage main/hoop setback 82-1/2″ measured from center of lower ball/joint to back of main/hoop tubing
  3. Mandatory x-brace (choose 1, no mixing of materials)
  4. Driver’s compartment safety bar (same material as x-brace)
  5. Fuel cell safety straps (min. 4), 1″ x 1/8″ strap steel
  6. Tail section replacement same dimensions as stock frame
  7. Floor plate 1/8″ steel place, minimum width 20″ at seat. **NOTE** x-brace must tie in to original frame, not frame plating.
  1. It is highly recommended that the main hoop (vertical to frame) be 39″ from the top of the frame. Floor pan must be mounted to the top of the X bracing.
  2. Door-bars should be flush to door panel (with the body)
  3. Door-bar height , minimum 20″ high from top of frame.
  4. Floor pan, minimum 20″ wide in driver’s seat area.
  5. Extra main hoop/head rest bar (optional).
  6. Cross-bar recommended height 20″ (for shoulder harness)
  7. Roof-hoop to fit roof side to side, minimum length 34″
  8. Roll-cage width same as stock frame width.
NEW Rear side panel dimensions May 8, 2015