I.H.F.S.P.A. 2014 Rules Page


The following rules apply for the 12,000lb Pro Farm Class


  • ENGINE = Cubic inch limit of 650 inches. Exhaust pipe must extend a minimum of 18 inches above the sheet metal with no curves or rain caps. Must have two 3/8” (grade 5) bolts installed 90 degrees from each other less than one inch apart in the exhaust. All blocks must be stock for make and model of tractor or a direct bolt in replacement from the same manufacturer that requires no modification to engine or bell housing. Deck plates allowed. No overhead camshafts allowed. No computers allowed controlling engine function of the tractor. Data acquisition is allowed.

  • CYCLIDER HEAD = All blocks must be stock for make and model of tractor or a direct bolt in replacement from the same manufacturer, that requires no modifications to engine or bell housing. No deck plates allowed.

  • INTERCOOLERS/ICE BOXES = Factory and aftermarket intercoolers are allowed. If using an intercooler, the intercooler must be covered with a hood, side panel or a shield. Only the use of one or the other cooler may be used not both.

  • INJECTION PUMP = Limited to one P-series injection pump with the same number of plungers as the cylinders. P3000, P7100 or P8600 Series pumps are allowed.

  • TURBO CHARGER = Only one turbo charger is allowed per pulling vehicle. The uses of Variable Geometry Turbo Chargers are not allowed.
  • RPM = 3000 Maximum for 470 to 650 cid. Up to 470 cid. 3500 RPM is allowed anything over 650 cid. factory RPMs only. Vehicle must have an ISSPRO #019R8906 magnetic pickup (available from Scheid Diesel 800-669-1934) attached to the front of the engine to measure engine RPM’s. The lead from the pick up to the rear of the vehicle is to be made of 14-16-gauge wire attached to a 100V, 3-prong female electrical outlet. The 2 wires from the pickup need to be attached to the 2 main spades, not the ground spade, of the electrical outlet. This outlet receptacle needs to be mounted next to the rear mounted air shutoff cable. Wire must be one continuous wire outside the side rails and visible. NOT SPLICES.

  • FUEL = Diesel fuel only.

  • WATER INJECTION = Water injection is allowed. No combustible agents allowed in water. Anyone caught running anything other than water and a lubricating agent will be disqualified for one year and ten days.

  • CHASSIS/FRAME = Maximum of 114” wheelbase, unless originally produced with longer wheelbase, then must remain stock length. The maximum length of 13 feet from center of rear wheel to forward-most portion (excluding front hitch). Any OEM modular or composite tractor must meet all component tractor rules.

  • RIMS = Steel rims are only allowed on the rears, front aluminum rims are allowed on the steer axle. Hubcaps and wheel covers are allowed.

  • TIRES = Maximum tire size 20.8-38’s or 18.4-42’s for all three classes. Tractors may run cut tires; bias or radial tires are allowed.

  • SHEET METAL = All sheet metal must be stock appearing and in stock location. Fiberglass nose is allowed. Frame rails must match engine frame rails on a White/Oliver chassis may be used in place of the heavy factory belly pan. (Sheet metal may be upgraded/beautified for cosmetic purposes only. Contact IHFSPA officer or board member for details.)

  • DRAWBAR = 20 inch drawbar height. Drawbar length can be no shorter than 18 inches form center of axle to the point of hook. Drawbar must have a 3-inch hole with a minimum of 1 square inch of steel at the rear of the hole. Drawbar shall be constructed so that in the event of a breakage the drawbar supports do not pull from a top link above the centerline of the rear axle of the tractor.

  • WEIGHT BRACKETS = Front weight bracket must be no more than 2 feet in front of nose cone of the tractor. The rear weights must not exceed the back of the rear tires.

  • WEIGH-IN PROCEDURES = All tractors must weigh in at 9250lbs. If your tractor is not light enough to compete in the 9250lb class you will weigh in at the 12,000lb class level. You may count down to 8000lb and count up to 12,000lb from calculations of your weights.

  • CERTIFICATION = If you miss the Certification/Weigh-In at the first pull of the year OR announced certification/weigh in location, the following must be followed. You must contact an Officer or Board of Director member, other than yourself, before coming to the pull you wish to first compete at. You must be on time as set by certification member (minimum of 1 hour) before the start of the event. If you do not follow these procedures you will not be allowed to compete in that event.

    SAFETY EQUIPMENT

    DISQUALIFICATIONS GENERAL RULES MEMBERSHIP & DUES