Thunder & Lighting Rules

1. Any type passenger car two or four door with a minimum of 101” wheelbase is permitted. No station wagons, no after market or home made bodies. All body parts must be stock. No plastic or fiberglass body cars. No independent rear suspension.

2. Wheelbase must b within 1” of factory listing for the year model.

3. All interiors must be removed. Doors must be welded or bolted shut. Hood and cowl must meet.

4. Stock bodies only, stock type bumpers. No bars above bumpers. You may weld flat bar from one end bumper to frame, may cut fenders for tire clearance. You may run bar in front of radiator and brace back to frame. This bar must be inside of grill area. No boxing interior in any configuration. Headlights must be covered with solid metal.
Floor pan and front/rear firewall must remain stock in there stock locations. (No excessive gutting)

5. There will be no screw jacks of any type allowed on front or year. Spring spacers are allowed. Lowering blocks will be allowed. Stock type springs in stock location on rear. Heavy coil springs will be allowed on front, stock suspension and steering is required. Minimum 5” ground clearance for frame and body. All suspension and steering mounting points front an rear must be in factory locations.

6. Shocks: No adjustable or coil over type shocks, stock only and must remain in factory position. Shocks can be claimed for$50 per shock.
Cars with strut suspension may run adjustable caster/camber plate. No adjustable spring spacers.

7. Stock spoilers: no homemade or wings.

8. Hood pins must be used to keep hood and trunk closed.

9. May use battery box and fabricated battery frame to secure battery. No battery in drivers compartment, unless completely boxed in.

10. Cars must have approved seat belt and double strap shoulder harness. Belts must be bolted to roll bar.

11. Full windshield is required. Lexan may be substituted and must fit as close as possible. Back glass is optional.

12. Roll bars are mandatory. No galvanized pipe. No exhaust tubing. No threaded joints. Bars must be fully welded. Gusses are required at all joints and welded on both sides. Pipe must be a minimum of 1 1/2 inches in diameter with a minimum of .095 thickness. May use racing type drivers seat. Seat must be securely fastened to roll cage. A full 6 point roll cage is highly recommended.

13. Weight: 3350 lbs maximum left side 54%. No more than 50% rear weight at any time. No fuel or fluids will be added after race.

14. Rear end for make an model only. must run a mini spool or open rear ends only. Stock disc brakes are legal. May weld axle gears. Seperate protest will be $100.

15. Fuel cell is mandatory, fuel cell must be a minimum of ten inches from the bottom of the fuel cell container to level ground. Must have a roll bar behind fuel cell. Must be securely strapped down with no less than four 1 1/2 inch x 1/8 inch steel straps. Steel firewall must be located between driver and trunk area. With no less than 20 gauge steel. No aluminum! Must have fire extinguisher with gauge.

16. Mechanical fuel pump only! No high performance. No electric fuel pump. No flex fan

17. Stock V8 engines only, no exceptions! No high performance. The only intake you can run is Chevrolet number 2101, Chrysler number 2176,Ford Cleveland number 2665 with 4 barrel heads number 2750 with two barrel heads, Windsor number 2181, these manifolds must remain as manufactured, no aluminum pulleys, stock type balancer. You can modify stock oil pan for capacity. Stock valves only. Chevrolet valve size 1.94 intake/1.50 exhaust. Ford valve size for Cleveland is 2.05 intake/ 1.65 exhaust for Windsor 1.883 intake/1.546 exhaust, may be bored .060 over and ,015 for wear. Flat top or dish pistons only. No pop-ups. Pistons cannot extend out of block,Single valve springs with damper only. Can pin rocker arm studs, can use poly locks, stock rocker arms only, stock hydraulic lifters only no rollers, no screw in studs or guide plates, maximum cam lift is .425 lift intake and .450 lift exhaust. stock valve jobs only. Minimum head volume in cc,s, all General Motors 72cc,s, Ford Cleveland 72cc,sFord Windsor 56cc,s, Dodge 360, 68cc,s. Engine must be in stock location. Must run stock motor mounts. You may weld a plate on the side of the motor mount to make it solid.

18. Stock factory non welded electronic ignition distributor only, no aftermarket ignition.

19. Carburetor: Holly 2300, two barrel carburetor, model #7448 (350) with a Venturi size of 13/16 inches and maintaining a throttle bore maximum size of 1 1/2 inches. Ford and Chrysler engines may compete with a Holley 2300 carburetor, model 4412 (500) main body mounted on a model 7448 throttle plate. An aluminum ring 3/8” in height may be installed to match Venturi diameter to throttle plate diameter. The rework guidelines for the Holley 2300 series carburetor are as follows: A. Body of carbs. No polishing, grinding, or drilling of holes permitted. B. The choke may be removed, but all screw holes must be permanently sealed. C. Choke Horn: choke horn may not be removed.D: Booster: Boosters may not be changed. Size and shape must not be altered.E: Venturi: Venturi area must not be altered in any manner. Casting ring must not be removed. F. Base plate: Base plate must not be altered in shape or size. G: Butterflies: Butterflies must not be thinned or tapered. Idle holes may be drilled in butterflies. Screw ends may be cut even with shafts, but screw heads must remain standard. H. Throttle Shafts: shafts must remain standard and must not be thinned or cut in any manner. I. Any attempt to pull outside air other than down through the Venturi is not permitted. J: Only paper air filter elements!

20. Carburetor spacers and gaskets: A. Carburetor spacer must be NASCAR approved. B. Only a one piece aluminum carburetor spacer 3/4 inches in thickness may be installed between intake manifold and carburetor. C: The spacer must have two holes with 1 1/2 inch openings located in the center that match the base of the carburetor Holes must be cut perpendicular with base of carburetor. No taper or bevels. D: A one piece gasket maximum .065 inch thickness may be installed between the carburetor and spacer. A one piece gasket maximum 1/4 thick may be installed between the spacer and intake manifold.

21. Exhaust Systems: Headers with 1 5/8 diameter with 3 inch collector will be legal, must exit to the side, minimum 3 foot exhaust, may run one exhaust out each side or both out one side. No H pipe or two in one allowed.

22. Drive train: 3 speed, 4 speed, or automatic with or without floor shift. All gears must work. Clutch pressure plate and flywheel must weigh 45 pounds minimum Chevy, 45 pounds minimum Ford must have steel bell housing or scatter shield. Separate Protest $100.

23. Drive Shaft: Stock steel- must have drive shaft loop 2 inches wide and 1/4 inch thick. Must be painted white. No aluminum driveshafts.

24. Fuel: Track fuel only.

25. No aftermarket brake pedal or brake system. All brake parts must remain stock.

26. Tires: 15” Hoosier Comanche tires of 15” with 8” width rims, rims must be same offset. This is the only tires you can purchase and must purchase tires from Florence Motor Speedway.

27. No reading between the lines: If not in the rules, must remain stock!

28. Any driver that wins two consecutive races must start tenth in the next race.

29. Claiming Rule: The engine may be claimed by another competitor for $2,000.00 less carburetor, headers, and distributor and pulleys.

30. Must run fully charged fire extinguisher.

FMS Rules

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November 3, 2020

(For Immediate Release)

As Florence Motor Speedway draws closer to the “Charlie Powell Memorial – SC 250 / SC 400” dual weekends of racing, we have some special info we would like to share. In an ongoing effort to solidify the “Charlie Powell Memorial” as a marquee event in the Southeast, the speedway has partnered with two well known staples in the racing industry.

Renegade Fuels has come on board as the title sponsor for the first weekend of two, the “South Carolina 250.” Renegade has been a longtime supporter of Myrtle Beach Speedway and will transition their support to the new Florence Motor Speedway.

Week two of the “Charlie Powell Memorial - South Carolina 400” will partner with a name that has become synonymous with racing in the Southeast. Solid Rock Carriers, out of La Grange, NC, has come forth to help propel Late Model Stock racing as they have done time after time. The feature race of the “South Carolina 400,” the 225 lap Late Model Stock Car portion, will now see drivers from all across the United States vie for a chance at the recently increased winner’s purse of $10,000.

The “Charlie Powell Memorial – SC 250 / SC 400,” a combined version of the former FMS Fall Classic and Myrtle Beach 400 events, will take place the two weekends leading up to Thanksgiving. Week one, the South Carolina 250 presented by Renegade Fuels, will see Limited Late Models, Super Trucks, and Street Stocks compete for the inaugural win to the 2020 event. The Solid Rock Carriers South Carolina 400, slated for week two, will have Late Model Stock Cars, S.M.A.R.T. Modifieds presented by SMART Chevrolet, the Carolina Pro Late Model Series, and the Allison Legacy Series.



If you haven’t already, please be sure to register for your respected race as the qualifying order for each division will be based off the invert order of how submissions are filed. Online entry can be found at while hard copy entry forms can be mailed to Florence Motor Speedway – 836 E. Smith St. – Timmonsville, SC 29161. Race schedules and other info regarding the dual weekend event can be found at

For those wondering about field sizes and format, please see below…

If car count for any division is 28 cars or less, the main event lineup will be set purely off qualifying times.

If car count is between 29-40, then top 20 from qualifying times will lock in and 21-40 will be delegated to a 25 lap B main with top 8 finishers advancing. All others will not make the main event and receive an attendance payout. Cars that transfer from B main will have the option to run the same tires, buy new tires for the main event, or change to tires that were purchased from FMS during the race weekend.

If car count is 41 or more, then top 20 from qualifying times will lock in and 21st on back will be delegated to two (2) 25 lap B mains with top 4 advancing from each. All others will not make the main event and receive an attendance payout. Cars that transfer from B mains will have the option to run the same tires, buy new tires for the main event, or change to tires that were purchased from FMS during the race weekend.

The race promoter will have the option to add up to two (2) provisionals making the starting field 30 cars.

Contact FMS


836 E Smith St, Timmonsville, SC 29161


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