The Premier Sporting Event of the Southeast


Challenger Rules

2018 CHALLENGER AR Series Championship Schedule

March 23-24 – Dillon Motor Speedway 4/10 Mile (SC)

April 14 – Dillon Motor Speedway 4/10 Mile (SC)

May 24-25 – Concord Motorsports Park 1/2 Mile (NC)

June 16 – Florence Motor Speedway 4/10 Mile (SC)

June 29-30 – Dillon Motor Speedway 4/10 Mile (SC)

July – TBD

Aug 17-18 – Myrtle Beach Speedway 1/2 Mile (SC)

September 14-15 – Carteret County Speedway 4/10 Mile (NC)

October 27-28 – Dillon Motor Speedway 4/10 Mile (SC)

Tentative Schedule Subject To Change


1970-2018 rear wheel drive cars with a minimum wheelbase of 104” 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 template 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 or plexiglass 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. Max overall spoiler height is 39”

9. Rear spoiler 5” high with maximum 60” width (max 300 square inches).

10. Wrecker hookup required front and rear of car.


1. Stock OEM front sub frame with tubing frame connector allowed.

2. OEM stock clip must have factory OEM mounting points for weight break. Rear

trailing arm mounts may be fabricated.

3. Fabricated clip and lowers allowed with weight penalty.

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


5. 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.

6. Upper A-frames may be fabricated.

7. Front sway bar may be OEM or aftermarket. Mounting points may be aftermarket.

8. Leaf spring and/or coil spring suspension allowed.

9. Steel rear lower trailing arms required.

10. A fabricated metal top link and track bar allowed.

11. Damper shocks may be used.

12. Rubber bushing, metal bushing, Teflon bushings or heim joints allowed.

13. Lowering blocks and trailing arms may be adjustable.

14. Aftermarket or 5×5 design hubs allowed. Wide 5 and Coilovers allowed see weight


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 shocks allowed. Shocks must be

same size from top to bottom excluding threads. Coil springs minimum diameter 5”. If

Running Coil Over eliminators must have 5″ min spring. Coil Overs Allowed.

3. Coil over eliminator allowed. No Coil Binding Or Travel Limiting devices. No Bumpstops

4. Shocks may be claimed for $160 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. Only allowed if claim is in front of you not behind you in the finishing order. A

driver or Owner can Claim must be made in CASH and presented to head 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. Steel 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



1. 104” minimum wheelbase.

2. Cars must not exceed the maximum allowable tread width of 65 ½ inches.

CRATE ENGINE chev#8602, chev#8603 may run a 390 4 Barrel carb. A chev#8604 crate engine will be allowed but must run up to a 450 2 bbl


1. This Crate engine can be used as all supplied parts from factory manufacturer. These

engines are subject to teardown procedures and legalities determined by tech committee.

Aftermarket HEI distributor and Cap, Aftermarket valve covers may be changed. The

staff at Dillon Motor Speedway has invested a lot of time and money to be “up to date”

on these engines, therefore make sure the engine is legal or it will be caught.

2. DMS Reserves the right to claim any Crate Engine that competes at the Dillon Motor

Speedway. DMS 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 the Dillon Motor

Speedway! If the Claim is denied the Car Owner will be subject to penalty and a fine!

3. 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 points.

4. 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. Contact Tech Official if

you need clarification to this rule.

BUILT DMS ENGINE may run 500 2 Barrel Carb 

1. Only stock production engines allowed. Chevrolet 350 cubic inch maximum, Ford 351

cubic. MASS Street Stock Engine Combinations Allowed per MASS Rulebook. 

inch, Chrysler 360 cubic inch plus overbore. 

1. . No polishing or coating inside of block.

2. Overbore of .060 + normal wear permitted.

3 Aftermarket stock length replacement rods allowed.

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

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


6. Connecting rods must be stock length for make and model of engine used. For

Example: Chevrolet 350 – 5.7 Rods

7. Flat top or dish 3 ring pistons permitted. Piston must not extend above top of block.

8. Crankshaft with stock stroke must be retained. Minimum weight 50lbs.

9. 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


10. Wet sump oil system only.

11. Enlarged oil pan allowed. Kick outs will not be permitted between the bolt holes

flange and the top of the added sump. Oil pan 4” minimum ground clearance.

12. No electric fuel pumps allowed.

13. Aftermarket valve covers allowed. Aftermarket pulleys allowed.

14. Engines under 310 cubic inch may be allowed a 390 4 barrel. Check with series officials 



1. Stock OEM production steel heads only. No Vortec heads on built engine.

2. 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.

3. Chev 70cc min; Ford (Clev) 68cc; Ford (Win) 58cc; Chrysler 68cc min; Chev 62 cc.

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 or Aftermarket Valve Springs will be allowed.

4. Screw in studs and guide plates permitted with any ratio roller rocker arms allowed.

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.

2. No high performance intake manifolds permitted. Intakes must be speedway approved.

3. No porting, polishing, or grinding will be permitted. Do not touch it.

4. Holley #7448 spacer a maximum ¾” metal spacer No Bevels. Spacer Gaskets .065

max thickness. Must not be coated

5. 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


6. Crate Motors may run up to a 1 inch thick aluminum spacer with no bevels. Must not

be coated.All carburetors and spacer plates must meet speedway specifications.


Up To A 390 4 Barrel Carb on 602 or 603 Crate Engine and Built Engines Can

Run Up To A 500 2 Barrel. A LMSC, 604 engines may run up to a Holley 2bbl carb


See below for rework guidelines:

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 is allowed as base weight. A 5 1/2 Multi Disc Clutch will

be allowed with a 50lb. weight penalty. OEM Clutch and Flywheel receives 50 pound

weight brake.

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. No 180 allowed.

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 allowed for base weight. MSD Ignition allowed with a 50 lb penalty.

2. Aftermarket or OEM HEI distributors permitted. 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. Fuel must be same color.

3. Fuel cells are recommended. Must be securely strapped down with no less than 1/8”


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 P25 Stamped “DMS” Track Tire from Tire Building Required. The

Hoosier Scuff Tires will be sold for $30 Each from tire building


1. 3000 lbs. minimum base weight for OEM Front Clip and Chassis Cars with driver.

3050 lbs. for OEM Front Clip Equipped Cars.

2. 55% left side maximum weight percentage on all cars.

3. A Fifty pound penalty may be traded off with 1% less left side weight.

4. 3100 lbs for Fabricated Front clip and Lowers cars with driver.

5. World Products Heads must add 50lbs. Weights Must Be on back of hood.

6. All cars will be weighed with driver in a driving position.

7. All lead weight must be added to chassis securely.

8. Cars may gas up after race.

9. Any car that runs a 350 carb on any motor combination recieves a 100 lb weight break.

No tungsten allowed. A 602 Crate Engine Equipped Car Recieves A 50 lb. weight penalty.


1. These rules are subject to amendments for competition when ample notice has been

given by the speedway. 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 committee’s discretion. This

decision can be made at anytime to give someone a chance to race at the Dillon Motor


2. Older Nascar Late Model Stock Perimeter Chassis Cars may be Approved for

competition with Example: MSD Ignition must add (50 lbs), Wide 5 hubs must add

(50lbs.) by the Head Tech Man. These cars are allowed will be required to add weight

and must be submitted for approval by head tech man before allowed to race. Head Tech

Man decision on weight penalty is Final! Older cars must be at least 5 years old.

3. A 390 4 Barrel Carb on Crate Engines and A 500 2 Barrel Built DMS Engines are

allowed for the New Years Bash. LMSC Built Engines, 604 or DMS Built with Less than 62cc head

engines may run up to a Holley 2bbl 450 Carb. If You decide

to run a 350 carb on any motor combination you can have a 100 lb. weight break No side

boards Tech Man Decision is FINAL! Your weight must be written on the back of the




Email ron@dillonmotorspeedway.com or call the Tech Man Ronnie Barfield @ 843-319-

9797 or Ron Barfield @ 843-496- 4792.