![]() Rear wheel width cannot be narrower than 34 inches from inside bead to inside bead of rear wheels.Bedside may be altered in front of wheel wells to match wheelbase on all trucks. Factory wheelbase may be shortened or lengthened to maximum of 134 inches.Headers and open exhaust allowed, must exit through hood or down and back.No spread port, billet, conventional spread port heads, Pontiac, GM LS heads of any kind small block or big block are not allowed.If tech official has any discrepancies over casting or port measurements may revert to picture below: Measurement between runners is a maximum of 0.415 but can be smaller. GM cylinder heads intake flange measurements are a maximum of 4.100 outside of port to outside of port but can be smaller. Conventional port designed head is classified as a head with the port spacing that must be left to right.GM cylinder head intake valve length can not be any longer than 6.420 in overall length maximum. Cylinder heads must have identification logo or cast numbers to prove their original origin and how it was manufactured.GM may run any conventional port designed head.Engine can be no further forward than 12 inches from front of block saver plate to center of front axle housing. No JC50, JC51, DRCE3, or aluminum blocks. Any Ford style block must be 4.9 bore spacing. Any Dodge style block must be 4.8 bore spacing. Any GM style block must be 4.84 bore spacing. Carburetor must have a stock 4500 base plate. ![]() Pro-Stock 4WD trucks shall follow current P.P.L Rule Book for Modified Four Wheel Drive except where superseded by rules found herein.Pro Stock 4WD Rules-Mid-South Pullers Association Modified Trucks – Maximum Wheelbase 133 inches Hitch 30% of Wheelbase 26 Inch Hitch Height 6500lbs. Open Four Wheel Drive/Pro Stock Diesel Trucksĭiesel Trucks- 25 inch Hitch Height 7800lbsīlower Trucks – Blower Overdrive Unlimited Maximum Wheelbase 133 inches Hitch 30% of Wheelbase 27 Inch Hitch Height 6800lbs. Light Weight Super Stock Tractors will follow PPL Rule Book. Limited Pro-Stock Tractors will follow PPL Rule Book. Super Modified Two Wheel Drive Trucks follow PPL Rule Book except any body style allowed. Class Rules Super Modified Two Wheel Drive Trucks
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