DISCLAIMER
The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the conditions of all events and by participants in these events. All participants are deemed to have complied with these rules. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION OF OR COMPLIANCE WITH THESE RULES AND/OR REGULATIONS. They are intended as a guide for the sport and are in no way a guarantee against injury or death to a participant, spectator, or official. The Race Director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his/her opinion do not alter the minimum acceptable requirements. Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is Final.
NO TRACTION CONTROL DEVICES OF ANY KIND!
NO BLUETOOTH IGNITION SYSTEMS
TECHNICAL INSPECTION
All cars MUST report to pre-race tech and register weight being claimed or you will not be allowed to qualify
Top 3 from feature MUST report for post-race inspection and engine P&G immediately. Failure to do so before going to your pit will result in disqualification with loss of pay and points BODY RULES
TOPLESS IS OPTIONAL
•(IF TOPLESS) Halo tops allowed and must be 100% FLAT across the top…no up-turned lips of any kind.
2026 Lucas body rules apply. However composite body panels are acceptable.
Any rear roof side mount tab that remains on car may not be more than 1.5” tall
Rear deck height maximum 40” at any point from top of T-bar to ground BEFORE QUALIFYING or BEFORE ANY ON TRACK COMPETITION. Series officials may and will check measurement at any point through the event before any car goes on the track
Spoilers: Maximum 8 inches of height and 72 inches of width
No more than 3 spoiler supports may be used
Wheelbase 103 inches minimum
WEIGHT
2300 lbs - 604/602 Sealed
2350 lbs - Modified 604/Unsealed 604
2350 lbs - Sportsman/NLMS type engine
2300 lbs - CT 525 Sealed
2400 lbs - Standard runner open aluminum heads -23* Chevy base 20* Ford base
2350 lbs - LS Steelblock
2450 lbs - Cast iron RR Chevy 23* base
Series reserves the right to adjust weights in the interest of competition should it deem necessary
ALL weights are after the race with 1 LB PER LAP BURN-OFF IN FEATURE ONLY
ENGINES
ALL ENGINES MUST HAVE CAST IRON BLOCK WITH EXCEPTION OF CT525
•NO TITANIUM RODS ALLOWED IN ANY ENGINE
ALUMINUM / CAST IRON HEADS
365” max cid
Chevy heads standard runner 23 degree based design and Ford heads standard runner 20 degree based design.
Ford N heads allowed.
Raised runner cast iron Chevy (RHS, Pro Action) allowed 23 base.
NO Brodix
-10 castings allowed for Chevy
Cast intakes only…NO sheetmetal GM CRATE
602/604 - Sealed 604 MODIFIED / Unsealed 604
365” max cid
Wet sump oil system only. No external pumps
SPORTSMAN / NLMS TYPE ENGINE
365” max cid
UNPORTED standard runner cast iron heads or unported Brodix SPEC aluminum heads only…may angle cut
Chevy heads 23 degree based and Ford heads 20 degree based.
Ford N heads allowed. Ford 347 crate engine allowed
Any cast aluminum intake
Any cam
Any piston
CT525
380” max cid
Must have one of the following seals:
GM factory seal bolts
Dirtcar DC-18
Blue Ridge Outlaw
LS STEELBLOCK
365” max cid
GM 4.8, 5.3, 6.0 cast iron blocks only.
Casting number shall NOT be removed
GM cathedral port head castings only.
Casting numbers allowed are as follows…241, 243, 799, 706, 862, 895, 317, 035.
Casting numbers shall NOT be removed.
May be ported
Cast single 4bbl intake manifold only.
Any single 4150 carb only…no fuel injection
Coil pack or distributor ignition allowed.
If running coil packs the MSD 6014CT ignition box is required.
Mechanical or belt driven fuel pumps only
Pulley driven water pumps only
Race gas or E85 only
CARBURETOR
Any 4150 series based carburetor
No injection
FUEL
•Racing gasoline and E-85 ONLY
NO Alcohol, NO Nitrous Oxide
Fuel Cell: All fuel cells must be mounted inside a 20 gauge metal box, supported by two (2) 1/8 x 2” steel straps, mounted inside the protective structure of the vehicle
All fuel cell must have a flap on top with a ball valve to keep fuel from running out if the car is upside down
Fuel cell must have the pick-up line coming from the top half of the cell
TRANSMISSION
Drive train must have transmission, mounted on the rear of the engine
NO direct drive or in-boxes
Any transmission with working forward and reverse gears permitted, and must lead to one driveshaft
DRIVESHAFTS
All drive shafts must be painted white or silver, and must be protected by a minimum of one safety hoop or a sling. (Carbon fiber shafts are recommended)
Driveshaft must be a minimum of 2 inches diameter
REAR END
Any type of quick-change rear end, No exotic materials allowed
Any steel or aluminum tube permitted. NO lead may be bolted to the rear end SHOCKS
Thru-rod shocks are NOT permitted. Shock shaft can’t exit both sides of the oil volume. Any shock with the dampening piston mounted more than one and one-half inch (1.5”) beyond the end of shock shaft, allowing the shaft to pass thru the main body on both ends simultaneously will be classified as thru-rod or thru-shaft
No Bluetooth or computerized components
Standard late model shocks.
Limit one per wheel except left rear may have one in front and one in back
NO shocks may be adjustable from the cockpit area
NO shock arms on the rear
NO spring rods in place of 4-bar rods
Rear Travel Limiter (Droop Rule)
A vertical travel limiting chain must be installed on the left rear of the car from the left rear axle housing to the frame. The travel limiting chain must attach to a bearing type mount or a clamp mounted bracket with the chain mounted to the top (12 o’clock) of the left rear axle tube, between the birdcage and the edge of the left rear bell of the axle housing, and to the left rear frame directly above the chain mount on the rear axle. Travel limiting chains must be installed so that when taunt they are as close to vertical as possible. One (1) compliance device may be used. The compliance device must not be more than one inch (1″) thick (without a load applied) and remain completely open and visible. Compliance devices can be rubber or any like material but must not be installed in any type of canister. Springs, spring-loaded, and/or pneumatic devices will not be permitted. No tapered, beveled, or roller skate type of compliance rubber will be permitted. Compliance devices must be solid material, same diameter top to bottom, not hollowed or drilled to soften the material.
The travel limiting chain including the compliance rubber must be installed so that when the car is jacked up from the rear the chain assembly is tight (no slack). The travel limiting chain is subject to inspection at any time during the event at the discretion of the officials. Cars will be jacked up on the under-slung frame rail one inch (1″) in front of the rear axle tube, between the center of the rear axle and the panhard bar mount. The left rear under-slung rail must be located between the left rear birdcage and the edge of the left rear axle housing bell. Cars will be jacked up until a forty-thousandths of an inch (.040”) shim will slide between the left rear tire and the ground. Once the car is jacked up as described a vertical measurement will be taken from the ground to the top trailing edge of the rear deck bar, six inches (6”) inboard of the left rear quarter panel outer edge. The measurement must not exceed fifty-one inches (51”).
All droop limiter assemblies must support the unsprung mass of the rear-end. The stretched value of the droop limiter assembly may be no more than three-quarters of an inch (3/4”) at 1,200 lbs. The procedure: preload 100 lbs. zero (0) distance, pull to a value of 1,200 lbs.
These penalties will be enforced on all Time Trials, Heat Races, B-Main and A-Main events:
Fifty-one and one-sixteenth of an inch (51-1/16″) to fifty-one and one-half inch (51-1/2″):
Post Time Trails will result in a one (1) row penalty in the original Heat Race lineup.
Post Heat Race, B-Main, or A-Main will result in a four (4) position penalty for that event.
Fifty-one and nine-sixteenths of an inch (51-9/16″) to fifty-two inches (52″):
Post Time Trails will result in a one (2) row penalty in the original Heat Race lineup.
Post Heat Race, B-Main, or A-Main will result in a four (8) position penalty for that event.
Fifty-two and one-sixteenth of an inch (52-1/16″) or higher:
Post Time Trails will result in the driver being penalized to the rear of the original Heat Race lineup.
Post Heat Race, B-Main, or A-Main will result in the driver being scored last for that event.
WHEELS
Any Aluminum wheel that is mounted by lug nuts, NO carbon fiber
Maximum wheel width 14 inches TIRES
Open LF •Hoosier 3 or 4 / 21 or 55 RF/LR/RR
American Racer 48 or 56 / PRO 3 or PRO 4 RF/LR/RR
All numbers and names must remain on the tire
Tires are subject to inspection or testing at any time by Dirt Outlaws Racing Series officials.
MUFFLERS
Only if required by track
DRIVER PERSONAL PROTECTION EQUIPMENT
Helmets
A helmet certified to Snell A2015/FIA-8859-2015, Snell SA2020/FIA-8860-2018, SFI 31.1/2015, or SFI 31.1/2020 is required to be always worn during competition or on the racing surface
Any type of head and neck restraint device is STRONGLY recommended
A driver suit certified to SFI Spec 3.2A/5 is required to be always worn during competition or on the racing surface
GLOVES
are mandatory to be always worn during competition or on the racing surface
Shoes certified to SFI Spec 3.3 are required to be always worn during competition or on the racing surface
FAILURE TO WEAR PROPER PPE WILL RESULT IN DISQUALIFICATION!
SEATS
Car should be equipped with SFI 16.5 or SFI 16.1 approved seat belt restraint system until the date of belt expiration
Seat belt restraint system shall be installed in accordance with the directions of system supplier or manufacturer
It is the responsibility of the driver to ensure his/her seat belt restraint system and all components are SFI approved and correctly installed and maintained
High-back full containment seat should be securely mounted to frame as recommended by the manufacturer
Suitable FIA manufacturer-approved Full containment seats are permitted
Cars must have a full-containment racing seat
A Marked electrical Kill Switch and a marked fuel shut off valve in reach of the driver
An easily accessible fire extinguisher of at least 2.5 gals FFF or equivalent required or fire suppression system is required
ANY DRIVER WHO GETS OUT OF THEIR CAR ON THE RACING SURFACE EXCEPT IN THE EVENT OF A FIRE OR AT THE DIRECTION OF TRACK SAFETY OFFICIALS WILL BE DISQUALIFIED FROM THE EVENT AND WILL NOT BE AWARDED PRIZE MONEY. NO EXCEPTIONS
RACE NIGHT FORMAT
Hot laps
Group A and B qualifying with 24 cars or more. Less than 24 cars it will be single group
Heats lined up by qualifying results. Number of heats and cars per heat will be based on car count.
Heats will be 8 laps unless otherwise noted in the driver meeting.
Remainder not transferring through heats will run LCQ/B-main for final transfer spots.
Typically 10 laps unless otherwise noted in driver meeting
We appreciate each and every participant as we work together to create a safe, responsible, and professional competition environment for all. Thank you!
- The Dirt Outlaws Racing Series
