2025 Rules Update: Component Chassis WILL be allowed. PPL Rules will be followed.

NEW for 2026 we will be following PPL fuel & water standards. Diesel fuel standards on the dielectric constant test are greater than 30 and less than 150. Pullers can use their OWN water in 2026. No oxygen carriers or combustion accelerators allowed in water injection. Only  water-soluble oil permitted in water injection. Water injection    maximum reading on efractoneter is 5.0  (updated 9/2025)

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All OEM chassis Pro Stock rules, including shielding, safety and SFI requirements, apply to this class plus the following rules. 

Class weight: 8700 lbs. 

A. Engines: 

1. No engine larger than 540 cid. (+ or - 1 percent) 

2. Component chassis allowed at 8,500 lbs.

3. Engine head must be OEM agricultural-type for that brand engine. (No billet) 

4. No overhead cams allowed. 

5. Maximum 2 valves per cylinder 

6. No inner / after coolers 

7. Diesel fuel only 

8. Maximum allowed "P" pump 3000 or 7100 series only (No aftermarket housing). Only one plunger per cylinder allowed. 

9. All air will exit through a 4.5” opening of exhaust housing. Exhaust wheel must protrude 1/8th inch inside bore. Maximum inlet 5.0”