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2020 FMS Late Model Challenger Rules


1970-2018 rear wheel drive cars with a minimum wheelbase of 102” Wheelbase.


  1. All cars must have a minimum of (2) doors, (2) rear quarter panels, deck lid, bumper cover, roof and hood. Body may be metal, plastic, or composite.
  2. All bodies must meet roof and spoiler height specifications.
  3. All bodies must be approved by speedway.
  4. All cars must be painted and lettered professionally.
  5. Rocker panels may be fabricated but must maintain 4” ground clearance.
  6. Front windshields optional. Back window optional. Clear lexan may be installed in the rear quarter windows. No side windows.
  7. Speedway approved window net must be installed in the driver’s side window opening.
  8. Body height minimum 4 inches.
  9. Rear spoiler 5” high with maximum 60” width.
  10. Wrecker hookup required front and rear of car.


  1. Stock OEM front sub frame with tubing frame connector allowed.( 50# weight break with oem stock fire wall and floor pan )
  2. OEM stock clip must have factory OEM mounting points. Rear trailing arm mounts may be fabricated
  3. Fabricated clip and lowers allowed.
  4. Frame rail min 2”x 3”. Minimum 3 inch Crossmember, Oil Pan, and Exhaust Clearance.
  5. Body and Chassis rails must maintain 4” ground clearance with driver.
  6. A Steel firewall must separate the driver from the engine compartment and fuel tank.


  1. A complete speedway approved roll cage.
  2. Roll cage must be constructed of roll bar tubing with a minimum outside diameter of one and half 1 ½” inches x .083 wall thickness.
  3. Roll cage must be centered on the frame. Perimeter style.
  4. Main roll cage uprights must be on top of outside frame rails.
  5. Full cage is required with four uprights and four top bars.
  6. Roll bars may go through front and rear firewalls.
  7. Minimum of three bars in driver’s and passenger’s door required.
  8. All bars within drivers reach must be padded.
  9. Perimeter Chassis 55% Max LS. A Older Chassis Non Perimeter May Be Allowed With A 2% Penalty


  1. Adjustable cups allowed on front and rear.
  2. Spring spacers, coil over eliminators, or screw jacks may be used on front and rear.
  3. OEM type steering box. Aftermarket tie rods, centerlink, idler, and pitman arm allowed.
  4. Lower A-frames must be OEM Design. Lower A-Frames must be same length. Aftermarket lowers can be used but must conform to OEM Design if the car is adding the weight for the fab clip. Aftermarket Spindles Allowed.
  5. Upper A-frames may be fabricated.
  6. Front sway bar may be OEM or aftermarket. Mounting points may be aftermarket.
  7. Leaf spring and/or coil spring suspension allowed.
  8. Steel rear lower trailing arms required.
  9. A fabricated metal top link and track bar allowed.
  10. Damper shocks may be used.
  11. Rubber bushing, metal bushing, Teflon bushings or heim joints allowed.
  12. Lowering blocks and trailing arms may be adjustable.
  13. Aftermarket or 5×5 design hubs allowed. Wide 5 and Coilovers allowed.


  1. 9 inch rear end may be car, truck, or floater. Any ratio. A standard quick change will be allowed. No Cambered Rear End Housings. +/- .4
  2. Detroit Locker, or Locked Rear End Units only.


  1. Tie rod or spherical end shocks allowed. OEM aftermarket Struts allowed.
  2. Aftermarket metal body shocks allowed. No canister. Coil Overs Allowed.
  3. No Coil Binding Or Travel Limiting devices. No Bumpstops
  4. Shocks may be claimed for $180 a shock excluding hardware. A claim must be made no longer than 10 minutes after the checkered flag falls. Driver must finish on lead lap to claim. A driver or Owner can Claim must be made in CASH and presented to the tech man before the 10 minutes is up. If driver or owner refuses the claim the driver will be DQed with no pay.


  1. Metal brake calipers required. Brakes on all wheels must work.
  2. Disc brakes may be used on front and rear.
  3. Aftermarket brake and clutch pedal allowed.
  4. Dual master cylinder allowed. Any type Brake bias adjusters allowed but not in drivers reach.


  1. 102” minimum wheelbase.
  2. Cars must not exceed the maximum allowable tread width of 66 inches.
  3. GM CRATE ENGINE MINIMUM Wt.; 8602 -3000 #, may use a 390 – 4 Barrel carb or a 500 2 barrel carb. 8603 – minimum weight 3050 may use a 390 – 4 barrel or a 500 2 barrel –  8604 minimum weight 3100  450 – 2 barrel carb. 500/350 with a 3/8″spacer ring and with a 1″ maximum spacer plate that matches the base plate holes of the Carb. 8603 or 8604  or a LMSW that runs a 350 -2 barrel carb will get a 100# weight break.
  4. The Crate engines must be used as supplied from manufacturer.(These engines are subject to teardown procedures and legalities determined by tech official. Aftermarket HEI distributor and Cap allowed, $300.00 claim. Aftermarket valve covers allowed.
  5. Crate engine is a great application for Local Racing if the competitor will leave them alone. Run them as supplied from the factory to ensure legality. Contact Tech Official if you need clarification of the crate engine rules.
  6. BUILT FMS 70 c.c. ENGINE 3100 # may run a 350 or a 500 2 Barrel Carb 
  7. Only stock production engines allowed. Chevrolet 350 cubic inch maximum, Ford 351 cubic. Chrysler 360 cubic inch plus overbore.

4 . No polishing or coating inside of block.

  1. Overbore of .060 + normal wear permitted.

3 Aftermarket replacement rods allowed.

  1. Replacement rods may not be lighter than OEM stock rods.

5.Only solid steel connecting rods permitted. No polishing or machine work will be permitted.

  1. Connecting rods must be stock length for make and model of engine used. Chev. max. 6″
  2. Flat top or dish 3 ring pistons permitted. Piston must not extend above top of block.
  3. Crankshaft with stock stroke must be retained. Minimum weight 50lbs.
  4. Crankshaft must not be Knife-edged. No excessive machining or grinding other than balancing. No drilled rod or main journals. Subject to template inspection by Tech Official.
  5. Wet sump oil system only.
  6. Enlarged oil pan allowed. Kick outs will not be permitted between the bolt holes flange and the top of the added sump.
  7. No electric fuel pumps allowed.
  8. Aftermarket valve covers allowed. Aftermarket pulleys allowed.
  9. Stock OEM production steel heads only. No Vortec heads on built engine.
  10. Stock Replacement or SR Head allowed with a 50lb. penalty

2.NO modifications, no porting, polishing, or angle milling. No grinding of any kind. 3 angle valve job ok as per Speedway rule. One cut below valve seat, to bottom of valve guide. Do not radius or blend bottom of cut below valve seat.

  1. Chev 70cc min; Ford (Clev) 68cc; Ford (Win) 58cc; Chrysler 68cc min; OEM valve size for cylinder head required. Steel valves required. 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


  1. Hydraulic or flat tappet cam and OEM diameter lifters with a maximum lift of Chev .480, Ford .512 Dodge .500 at valve with valve lash as ran in race. Lift will be measured at the retainer.
  2. Any steel type timing chain allowed.
  3. OEM Valve Springs on Crate engines required ( FMS built engines may use after market springs)
  4. Screw in studs and guide plates permitted .
  5. Stud girdles are permitted. Poly lock allowed.


1.Cast Iron two barrel intake or Edelbrock performer aluminum intakes. Chevrolet #2101

Ford Windsor #2181, Cleveland #2665, #2750 and Chrysler #2176 or P#4532852.

  1. No high performance intake manifolds permitted. Intakes must be speedway approved.
  2. No porting, polishing, or grinding will be permitted. Do not touch it.
  3. Holley #7448 spacer a maximum ¾” metal spacer No Bevels. Spacer Gaskets .065 max thickness. Must not be coated
  4. Holley #4412 spacer a maximum ¾” metal spacer with 2 holes (max 1.690) centered in spacer with a straight cut. No bevels. Spacer gasket .065 max thickness.Must not be coated.
  5. Crate Motors may run up to a 1 inch thick aluminum spacer with no bevels. Spacer plate holes must match carburator base plate holes.

Must not be coated.All carburetors and spacer plates must meet speedway specifications.



A LMS  engine minimum weight 3100 # may run a Holley   “2 barrel  450”carb.  See below for rework guidelines:   Holly Ultra xp is not allowed

  1. No polishing, grinding or machine work allowed on any part of carburetor.
  2. No alterations except choke hardware may be removed and all vacuum ports must be plugged. Any bowl or metering block may be used. Base plate must not be altered in shape or size.
  3. Boosters may not be altered in any manner including size, shape or height of model #.
  4. Any attempt to pull outside air other than through the venturi is not permitted.


  1. Round air cleaner element minimum of 12 inches; maximum of 17 inches.
  2. Element must be minimum of 1 ½ “and a maximum of 4 inches in height.
  3. Dry type paper element only. No cold air boxes or cowl induction allowed.
  4. No tubes, funnels or anything which may control the flow of air are permitted.
  5. Air cleaner base must not be above choke horn.


  1. OEM standard production Automatic, Manual transmissions permitted.
  2. OEM Steel Clutch and Flywheel over 33 lbs. receives a 50 pound weight break.
  3. A 7 1/4 Multi Disk Clutch or a 5 1/2 Multi Disc Clutch will be allowed. Must add 50lbs for 5 1/2 clutch.
  4. Hydraulic clutch control permitted.
  5. Must have steel bell housing that is speedway approved.
  6. Drive shaft must be of magnetic steel only. Drive shaft must be painted white with two safety loops attached to the bottom of car.


  1. Regular Headers (4 into 1) will be permitted. No stepped headers .
  2. Cast iron manifolds permitted.
  3. All LH exhaust pipe must exit behind the driver.


  1. Engines may be interchanged from one body manufacturer to another.
  2. Engine must be centered in chassis. #1 spark plug in line with upper ball joint. Ford max 2 inches back From #1 spark plug
  3. Minimum crankshaft height is 12”, from the center of crank pulley to the ground. Engine and header pipe clearance must be a min height of three inches (3inch) with driver.


  1. Aluminum radiators permitted. Any radiator allowed.
  2. Overflow hose recommended.
  3. Antifreeze is not permitted.


  1. HEI Ignition and MSD Ignition allowed.$300.00 claim
  2. All Distributors can be locked up or welded in Crate or Built.
  3. Only 1 coil permitted.
  4. Only one 12-volt battery permitted.
  5. No adjustable timing controls.
  6. No open ended wiring in driver’s compartment.
  7. Any type traction devices are not allowed. No computerized systems are allowed.
  8. All ignition systems must be acceptable to speedway officials.


  1. Race fuel required. No other mixtures of any kind.
  2. All Fuel must pass Speedway Fuel specifications.
  3. Fuel cells are recommended. Must be securely strapped down with no less than 1/8” steel straps. Fuel cell must be vented high and to the left side.
  4. The maximum capacity allowed is 22 gallons.
  5. Fuel cells must have 8” minimum ground clearance.


  1. Maximum width 10”on all 4. 15” Steel wheels only.
  2. Air bleeders will not be permitted. No chemical tire treatment allowed.
  3. Tires used for qualifying and race must be approved by the speedway.
  4. Any car tires from any source other than speedway tire building will be disqualified.
  5. Hoosier Scuffed Track Tire from Tire Building Required.


  1. Weight 3000 # 8602 with 500 OR 390 CARB. — 3050 #  8603 with a 390 or a 500   –  3100 # 70 cc with 500 carb — 3100 # LMS – 8604 — 450 Carb — LMS and 8604  with a 350 carb. may weigh 3000 #
  2. 55% left side maximum weight percentage on all cars.
  3. All cars will be weighed with driver in a driving position.
  4. All lead weight must be added to chassis securely.
  5. Cars may gas up after race.


  1. These rules are subject to amendments at any time to keep all race cars on an equil competeve racing program. Any car that does not conform to the above rules may be allowed to compete with a weight and/or restrictor plate at the tech officals discretion.




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