Class Designations
Stock Class | Super Stock | Modified | Super Modified
Stock Class
Tires 37 inch and under, No cut tires allowed.
Engines Must be correct for year, make and model.
Factory blocks only, No Bowtie, SVO or Mopar Blocks.
502 and V-10 in original chassis only.
No cubic inch limit on displacement.
Big Block in ¾ ton or above only.
No race ignition
Gasoline or diesel only.
OEM cylinder heads only, original aluminum only.
Must maintain 13 inches of vacuum @ 800 rpm.
Any dual plane manifold allowed, open plenum ok.
No single plane manifolds allowed.
Headers allowed, must exit down, may be open.
600cfm single inlet carb max. Any OEM ok.
No electric water pumps or fans.
Pump gas only, 92 octane max no additives. No 101.
Turbo diesel must compete separately.
Trans Must be original trans for (ymm).
No Trans Brakes allowed.
No stall converters allowed
Original transfercase only.
No linelocks
Body No bodyswaps, OEM only.
Body and interior must be completely intact, no gutting.
Only minor fender trimming allowed for tire clearance.
OEM seats only, no light weight replacements.
Functional radiator in stock location only.
OEM bumpers and tailgate required.
Wipers windows and lights must work.
Open top vehicles must have roll cage.
Frame No modifications to frame allowed.
Aftermarket lift kits allowed.
Vehicle must be in safe operating condition.
May not upgrade ½ ton axles to ¾ ton 8 hole.
Must have good brakes. Front and Rear!
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Super Stock
Tires 40 inch max diameter, No cuts allowed
Engine Aftermarket small blocks allowed, 434 max displacement.
OEM cast iron engine blocks only on Big Blocks.
Cast iron cylinder heads only. 23 degree max.
No nitrous, no blowers, no turbos, no alcohol allowed.
Single carb 750 cfm max.
Double pumpers and Demon carbs allowed.
No Dominators or Predators.
Race headers allowed, Must exit down.
Race fuel allowed, no masking or cover scents allowed.
V-6 engine swap allowed in mini trucks.
2 throttle return springs required.
Trans OEM style transmission only.
Trans brakes allowed. Must have Trans Shield.
Must have Driveshaft loops if equipped with brake.
4500 max stall speed torque converter.
Body Must have full stock body, minor fender trimming for tire
clearance only.
May remove bumpers and tailgate.
Full stock frame required.
Full OEM glass required.
No fiberglass replacement parts allowed.
Fuel cells and fuel tank relocation allowed.
Open top must have roll cage, no show bars.
Blazers/Suv type vehicle with pickup kit legal.
Battery may be relocated .
Race seat with harness ok.
No extending or modifying of frame.
No lightening of frame.
Must have toggle style kill switch within drivers reach.
Susp. Must maintain OEM suspension, lift kits ok.
Ladder bars and traction bars allowed.
4 wheel hydraulic brakes required.
Solid axle swap allowed in IFS models.
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Modified
Tires 54 inch max DOT no cuts, no paddles.
Engine Max cubic inch displacement SB 434, BB 514
Aftermarket blocks allowed, cast iron only.
Conventional bore spacing only.
Aftermarket blocks must voluntarily check size.
No blowers or turbochargers allowed.
No nitrous oxide allowed.
Turbo diesel ok, single turbo only.
Aluminum heads allowed, 11 degree max angle.
Headers must point rearward or up, not sideways.
Any internal engine modifications allowed.
Gasoline only, no alcohol, no cover scents.
Dual carbs, Demons, Dominators, Predators ok.
Aftermarket fuel injection not allowed.
Minimum of 2 throttle return springs required.
Trans Trans brakes allowed, must have trans shield.
U-joint shields required if using trans brake.
Any torque converter allowed
Must have 1 driveshaft loop per shaft.
OEM transfer case only, No chain drives.
Frame Oem frames only, No tube or box frames.
Frame may not be lightened or compromised
Frame may be shortened or lengthened.
Engine cannot be set back from stock location.
Front differential must remain in original location.
Original engine setback must be maintained on engine
Transplants. Front of engine must measure original distance
From axle centerline to front of harmonic balancer.
This measurement will be determined by where the engine
Was located in the vehicle it was originally installed in.
If you are planning to put a V-8 engine from another
Manufacturer in a Jeep, Scout or Landcruiser body, The
Engine will need to be moved approximately one foot
Forward of its original mounting to meet this criteria.
If you are not willing to do this, chose another vehicle or
Another class. This dimension must be within ½ inch
Of the original measurement.
Susp. Ladder bars and traction bars allowed.
3 and 4 link suspension allowed.
Coil over suspension allowed.
Steering gear may be changed, must be safe.
Body Center driver location ok.
Body swaps ok.
Front fenders and grille must surround engine
Engine must not extend beyond front of body.
Body cannot be set back on frame excessively.
Radiator not required.
Glass may be removed from vehicle.
Gutting allowed to remove weight.
No race bodies, narrowing OK
Must maintain front and rear body panels.
Must maintain original passenger compartment.
Body may not be completely removed.
Original metal type firewall required, No flashing.
Trimming of wheel wells for clearance allowed.
Open top must have roll cage, No show bars.
Fuel cell and fuel tank relocation allowed.
Battery must be securely mounted.
Safety Seatbelts required, 5 point mandatory except on
Full body and interior.
Helmet required.
Must have fire extinguisher on board within reach.
Firesuit, gloves and headsock required on open top.
Must have good brakes. Front and rear.
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Super Modified
Tires 0-44 DOT Cut tires allowed, No paddle tires allowed.
0-48 tractor tires allowed.
Lug nuts and studs must be race approved and open
Ended, NHRA specs
Must have all studs and nuts.
Engine Max displacement 665 cubic inches
Conventional bore spacing only.
Race gas or Methanol only, No nitro methane.
No cover scents, No additives.
No superchargers, no turbochargers, no nitrous oxide.
Any engine setback, rear engine ok.
Any normally aspirated induction system allowed.
Any cylinder head allowed.
Minimum of 2 throttle return springs required.
Must have external kill switch externally accessible.
Trans Any automotive transmission allowed.
Trans brakes allowed.
Transmission shield or blanket required.
U-joint shields required on differentials.
Driveshaft loops required on each shaft.
Chain drives or transfer case allowed.
Body Must have some type of body.
Must have metal firewall between driver and engine.
Driver must be protected from fuel, coolant, tires.
Must have roll bar and roof panel.
Frame Aftermarket frames ok must be safe.
Broken welds will result in disqualification.
Any suspension ok, must be safe.
Steering must be safe and in good condition.
Must have good brakes on both axles.
Safety Must have 5 point harness.
Tether kill switch required on rear.
Inoperative kill switch will result in disqualification.
Must have fire extinguisher on board.
Approved firesuit, headsock and gloves required.
Must have valid drivers license.
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