1/8th mile racing.
1. 400 Pro Tree Heads Up Racing
2. Engine: (SINGLE POWER ADDER ONLY)

A. Naturally Aspirated
Small Block No minimum weight
Big Block No minimum weight

B. Nitrous weight
Small Block 2150 lbs
Big Block 4.840 & 4.900 Bore Center 2450 lbs
Big Block 5.00 Bore Center 2550 lbs
Big Block 5.20 & 5.30 Bore Center 2650 lbs

C. Turbo Charged and Super Charged
Single SB 2500 lbs Big Block 2700
Twin Turbo up to 94mm SB 2700lbs BB 3000 lbs
Twin Turbo larger then 94mm SB 2800 lbs BB 3100 lbs
Centrifugal Superchargers SB 2500 lbs, BB 2700 lbs
Roots Supercharger SB 2500 lbs, BB 2700 lbs
Max bore spacing on all forced induction application is 5”
Max cubic inch on all forced induction entries is 700 cid
Over 5 inch bore spacing add 100lbs also limited to max of 94mm turbo
Max turbo size 108mm on twins.
Twin Turbo's Big Blocks 94mm or smaller under 550 Cid deduct 100lbs
Twin Twin Small Block 88 or 91 mm deduct 100lbs
Twin Turbo Small Block 85mm deduct 150lbs
Twin Turbo Small Block 80mm or Smaller Deduct 200lbs
Small Block 8.300 or Shorter deck Deduct 150lbs


Screw superchargers: Max cubic inch 540 cid
"D" rotor 2900 lbs. Max O.D.125%
“C” rotor 3000 lbs. Max O.D. 125%
No Billet case allowed.
4 & 6 cylinder alcohol & intercooler permitted 2300 #