5000 RPM Antique V8 Gas Rules

1- Tractor must be 1972 or older and be an agricultural 2 wheel drive tractor. No industrial or Experimental tractors.

2 – Engine must be naturally aspirated V-8, with a cubic inch displacement no larger than 516c.i. Block and cylinder heads must be of cast iron. Single carburetor, no fuel injection, no turbo chargers or forced air induction of any kind.

Aluminum manifolds are permitted. Headers must exit in an upward direction. Motor must be parallel with input shaft of transmission and be mounted in the center of the frame. Spark plug guards must be in place to deflect downward or contain spark plug.

3 – No power shift or locking differential, factory TA permitted.

4 – Kill switch of a breakaway type is required and must be wired to MSD and fuel pump. Switch must be accessible and functional.  Subject to random inspection.

5 – Crank driven engine cooling fans must be a minimum rating of 8,000 RPM or electrically driven.

6 – It is recommended that the fuel tank be mounted in front of tractor.

7 – Maximum allowable RPM’s will be no greater than 5000. All ignitions must use a MSD system with a 5000 maximum rpm limiter chip or limiter box.  Must be equipped   with a recall Techs. No more than 100 rpm variation over 5000. If checked and techs recall is cleared it is an automatic DQ

8 – Fuel; Gasoline fuels only with a maximum  of 750 specific gravity, no E85, no alcohol, no pressurized fuels, no nitrous oxide, no oxygen accelerate, no nitrogen methanol, and no propylene oxide. Racecar gasoline may be used.

9 – Crank harmonic dampener hub must be SFI 18.1 rated or a steel shield must be constructed tightly around a non- rated pulley or hub to contain it in all directions of exit.

10 – Pressure plate must be competition type and be SFI approved.

11 – Tractors built prior to 1/1/2006 must have a steel constructed flywheel of greater than 1 ¼” maximum thickness. Cast iron flywheels are not permitted. Flywheels must be accessible for inspection. Tractors must have a steel shield around flywheel and clutch with a SFI blanket with a minimum rating of 4.2. The shield must be made of .25 minimum thickness and minimum with equal to the thickness of the flywheel and pressure plate assembly. Shield may be attached to bell housing, engine or chassis.

12 – Tractors built after 1/1/2006 must have a SFI rated competition designed flywheel and steel bell housing with a SFI rating of 6.1, 6.2 or 6.3.

13 – Universal joints, chain couplers and drive shaft must be surrounded by .25 steel the entire length.

14 – Air cleaners must be under hood.

15 – Steering may be rack and pinion or hydraulic.

16 – Diesel conversions are allowed but must run on gasoline with no injection.

17 – Throttle has to be dead man type with return spring.

18 – Frame ties are mandatory and must be mounted to the rear end. Ties must extend ahead of the rearmost mounting location of engine block. Ties must be able to support the tractor with bolts removed from rear end and transmission.

19 – Wheelie bars are required and should not be attached to the draw bar in any way. Bars must extend beyond rear most plane of tire and be able to support the tractor. Tech crew has right to put jack under skid pad. Skid pad height is 10 inches maximum.

20 – Fenders and roll bars are required. Roll-over protection must extend higher than the drivers helmet.

21 – Tractor has to be equipped with fire extinguisher ABC or Halon for all.

22 – Sheet metal must be stock appearing and dimensions. Must be located in stock location as measured from center line of rear axle. Tractor wheelbase may not exceed 102” from center of rear axle to center of front spindles. Front wheels must overlap rear tires when sighted from front of tractor. Rear end, transmission and axle housing must appear stock. Internal modifications are allowed but transmission shafts must remain in stock location. No differential locks permitted in rear end. Front end and frame rails can be fabricated, but must safe for heaviest class. Frame rails may extend to the rear axle. Maximum overall length, including weights measured from center of rear axle is 12 feet.

23 – Draw bar must not exceed 20” in height and not less than 18” from center of rear axle. Drawbar must be stationary in all directions with a minimum of 3 ½” hole.

24 – Driver must have a SFI 3.2a/1 or better jacket and SNELL crash helmet. Must have a valid driver’s license. Seat belt or harness must be worn.


25 – Drivers must stay on the seat at all times. Hands must be on the steering wheel, hand brakes, hand clutch or throttle at all times during pull. Double-clutching is prohibited.

26 – Technical inspections; all tractors must be pumped; pans sealed, and go through a complete tech. inspection. There will be random checks during the season. There will be no more than a 1% discrepancy in the 516 cubic inch rule when performing the pump test.

27 – Tires: 18.4 x 38 maximum allowed bias or radials with any cut.

28 – Protest Fee: All items of protest shall be $500. (Cash Only) If the protest is sustained, the protest fee, less the cost of any required inspection, will be returned to the protesting member. If the protest is not sustained, the protest fee, less the cost of inspection, will be forfeited to the protested member.

29 – Drivers found cheating he will be banned from pulling for one year plus one pull.

30 – Rules will be in effect for 5 years starting 4/1/2010 and running through 11/1/2014. Rules can only be changed for safety reasons. Only individuals that have pulled at least one time in the 5000 rpm class in a calendar year have the right to vote on rules. Each tractor has only one vote.

31 – Single pull events, weight class will be 6500#

Classes are  6000, 6500

for more information  330-356-2020 or 330-814-7245