6500 lb. Limited Modified Rules
1. 572 cubic inch limit (1 standard single blower 8-71 max. size limit). Inside measurements - 16 inch rotor case length, 11.25 inch rotor case width. 2 blown engines can pull with one motor not running, or 2 naturally aspirated V-8 engines may both be run, or one 750 cubic inch naturally aspirated engine may be run. 3% cubic inch tolerance. If running two 572 c.i. inches then total cubic inch may not be over 1144 cubic inches. Hi-Helix chargers ok with weight at 6200 lbs. No turbos allowed.
2. 1 spark plug, 2 valves per cylinder.
3. Side shields required from spark plug down.
4. Safety shields on anything that turns (SFI Bellhousing, flex plates, billet flywheel, balancer cover, and blower restraints).
5. Driveline must be completely covered (360 degrees) by 1/4 inch metal.
6. 30.5-32 max tire size. Any wheel width allowed.
7. Maximum 14 foot from center of rear end to farthest point forward.
8. Hitch 18" back, 20" high, and 1" thick metal at hook point.
9. Functional wheelie bars are required.
10. Fuel shutoff required on injected engines.
11. Must have roll cage and harness.
12. Please check general safety rules for mandatory safety requirements.
