Diamond Pistons True 10.5
1/4 Mile, Heads Up, .400 Pro Tree, 32 Car Field, Sportsman Ladder
Stock front frame rails & suspension required. Aftermarket control arms allowed as long as they bolt in stock locations. Direct bolt in aftermarket parts permitted. Firewall must be in the stock location. Rack & pinion steering allowed. Aftermarket coil over shocks allowed and aftermarket direct replacement struts are allowed. Aftermarket bolt in sub-frame allowed. Must bolt in unaltered to stock OEM mounting locations.
Stock style or ladder bar suspension allowed, four links add 75 lbs
No wheelie bars (wheelie bars allowed on front wheel driven combos only)
Must be stock appearing interior, with two front seats
Torque converter driven only. Aftermarket heavy-duty cases allowed, air shifters & trans-brakes allowed. Clutchless trans add 150 lbs
28 x 10.5 wall tire only (No larger, no W tires, stiff wall's OK) or 275 Radial Tire or Smaller
ALL cars must have mufflers - inserts are NOT considered mufflers
Weights:
Naturally Aspirated:
Small Block: 2550 lbs
Big Block: 2750 lbs
Nitrous Oxide:
Small Block: 2850 lbs
Up to two stages, 3 stages or more add #100
Big Block: 3150 lbs
1 stage of nitrous, multiply stages add #100
Turbo Charged and Super Charged :
SB Turbocharged: 3150 lbs
(Single 88mm Max Inlet Size Allowed)
SB Twin Turbocharged: 3350 lbs
(Twin 76mm Max Inlet Size Allowed)
SB Supercharged: 3150 lbs
(Gear Driven Blowers Allowed, F1R max. size blower)
Single BB Turbo/Supercharger: 3300lbs
88mm or F1R Max Allowed (Gear Driven Blowers Allowed)
6 Cylinder Turbo/Supercharged: 2550 lbs
(Single Power Adder Only, F1R or 88mm Inlet Max) Add 100 lbs for twins, 76mm Max Inlet Size Allowed
4 Cylinder Turbo/Supercharged: 2150 lbs
(Single Power Adder Only, F1R or 88mm Inlet Max) Add 100 lbs for twins, 76mm Max Inlet Size Allowed
Turbo & Blower Inlet sizes will be checked with a GO/NO GO gauge | 
