2023 Mod lite Rules
Tires will be for 2023 season Hoosier and American Racer
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 condition of all events, and
by participating in these events, all participants are deemed to have complied with these rules. No expressed or implied
warranty of safety shall result from publications of or compliance with these rules and/or regulations. They are
intended as a guide for the conduct of 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. No expressed or implied warranty of safety shall result from such alteration of specifications.
Any interpretation or deviation of these rules is left to the discretion of the officials and their decisions are final.
1 PREFACE
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 condition of all events, and
by participating in these events, all participants are deemed to have complied with these rules. No expressed or
implied warranty of safety shall result from publications of or compliance with these rules and/or regulations. They
are intended as a guide for the conduct of 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 opinion do not alter the
minimum acceptable requirements. No expressed or implied warranty of safety shall result from such alteration of
specifications. Any interpretation or deviation of these rules is left to the discretion of the officials and their
decisions are final.
2 CLASSIC MODIFIED (Dwarf Car) & MODIFIED LITE (IMCA/DIRT) SPECIFICATIONS
2.1 Any car specifications not covered in these body specs are subject to Modified Lite STARS
Series officials’ interpretation. Any significant performance advantage will be addressed on an
individual basis. Modified Lite STARS Series official’s reserves the right to determine what
constitutes an unfair advantage.
2.2 1928-1948 American- made production vehicles only, 5/8 scale, two-door vintage coupe, sedan, sedan
delivery, wagon, or pick-up truck. These are to be known as Classic Modified body styles.
2.3 Modified appearing body style such as IMCA/DIRT modified. These are to be known as Modified Lite
body styles.
2.4 All chassis specifications are the same for all body styles.
2.5 All measurements may be taken with or without the driver and/ with or without fuel tolerance permitted on
all body dimensions is maximum of +/- (plus or minus) ½” –inch (0ne half inch). This is a tolerance, not a
dimension that is intended to be added to the body dimensions.
2.6 The intent of these specifications is to follow the bodyline and design of an existing CLASSIC/ IMCA/ or
DIRT modified racecar. Body must be 5/8 scale, stock appearing. Maximum outside tire width 60”, Cars must
pass freely through a hoop 60 1/2” wide by 52 1/2” high, 73” wheelbase length plus or minus 1”. When
measuring wheel base, front tire must be in line with rear tire. The hoop already has tolerances built in so if
any part of car touches the hoop it is illegal!
60 ½”
52 1/2’”
1/2”
Figure #1
IMCA STARS MODLITES
2.7 NO car over 52” tall, top to ground. Body height maximum 46”, bottom edge to top (including frame rail).
2.8 Maximum body width @ Decking 50”, Maximum frame width 34” min 30.”
2.9 132” maximum total length, bumper to bumper measured from outside to outside of bumper.
2.10 Kick outs or side nerf bars must be mounted two or three points and run full length between tires. 1 ¼”
max .125 wall thickness. Cannot stick out beyond 1” from the side of the rear tires, and must not tough hoop
during tech.
3 CLASSIC MODIFIEDS BODY SPECIFICATIONS
3.1 Must have grill shell or simulated open radiator matching original body style, any material.
3.2 Doors, windows, and cowlings must retain stock appearance. Hood louvers allowed for cooling, but must
maintain stock contour.
3.3 Engine compartment must conform to scale and match contour of body. Hole may be cut for breather
clearance only. Ram air induction system prohibited.
3.4 Must have closed trunk lid or fully enclosed trunk access panel conforming to original bodylines. Louvers
allowed no holes.
3.5 No fenders.
3.6 No wings or spoilers.
3.7 Body will be metal construction, 26-gauge steel or .040″ aluminum minimum. All exposed edges must be
folded or trimmed over. No lips or spoilers of any kind.
3.8 NO open top cars (roadsters, convertibles). Only closed top, meaning hardtop.
3.9 Body contour must follow frame and roll cage. Roof hatch allowed.
3.10 Drivers’ door must be operational and equipped with a secure latch.
4 MODIFIED LITE (IMCA/DIRT) BODY SPECIFICATIONS (DIRT Figure 2-5,10, &13) (IMCA Figure
6-9,11, &13)
4.1 86″max – Door and rear quarter length.
4.2 30″ min 36″ max – side height of rear quarter panel from the ground. 30” max height of quarter panel.
5 MODIFIED LITE (IMCA/DIRT) HOOD AND NOSE SECTION
5.1 20″ min 29” max – hood height excluding breather protectors (bottom of frame rail to top of hood).
5.2 Rear of hood becomes part of windshield area rules.
5.3 No part of nose section, (which ends 8” in front of the lower ball joint), may be wider than a maximum of
24”. Modified Lite DIRT design must resemble approved DIRT nose.
5.4 Hood may taper out to door panels at the rear.
5.5 Maximum 1.5-inch side fins allowed on aluminum nose, must end at hood. No fins allowed on hood.
5.6 IMCA/ Body only – approved plastic nosepieces allowed. Plastic nose must be mounted in an approved
manner and can extend no further back than front of hood.
5.7 Bumper may not extend more than 30” forward of spindle. Measurement to be taken from either side of car
center of spindle to outside of front bumper.
6 MODIFIED LITE (IMCA/DIRT) ROOF PANEL (DIRT Figure 5) (IMCA/ Figure 9)
6.1 40″ min 48″ max – length of roof panel. 36″ min 42″ max – width of roof.
6.2 No part of roof panel may have more than 14° angle of rake from front to rear (0° from side to side) as
measured of the frame. No deflector on upper sides or rear of roof panel. Roof entrance hatch optional.
6.3 Maximum .75-inch ridge on sides of roof.
6.4 Maximum .75-inch rear roof stiffener (must face down).
6.5 Maximum 1.5 inch rolled down rock guard allowed on roof front.
7 MODIFIED LITE REAR UPPER QUARTER PANEL (Sail Panel) IMCA/DIRT Figure 13
7.1 20″ min 38″ max rear upper side panel may contain plexiglass.
7.2 Sail panel may be no higher than an imaginary line from the rear edge of roof panel to 44” above the ground
measured at rear of deck, with a 1” upward bow and a 4” outward bow allowed. Point of sail may extend
2” past rear of quarter panel. Spoiler end caps must fit within this rule. NO TOLLERANCE.
7.3 Sail panels may have window cut outs but both sail panels must be a mirror image.
8 MODIFIED LITE (IMCA/DIRT) SIDE WINDOW (DIRT Figure 4) (IMCA/ Figure 8) (Mandatory NO
TOLERANCE)
8.2 Driver and passanger side window openings must be at least 18” long by 10” high.
9 MODIFIED LITE INTERIOR (DIRT Figure 10) (IMCA/ Figure 11)
9.1 46″ min 50″ max – width of rear shelf and body panels.
9.2 Rear shelf and cockpit area may have no more than a 5° max rake front to rear and 0°side to side and
may not be concave or convex in design. (Flat deck only)
9.3 Cockpit areas will not be fabricated similar to the late model style design. No convey or convex decking.
10 MODIFIED LITE INTERIOR SPECIFICATIONS (DIRT Figure 2) (IMCA Figure 6)
MODIFIED LITE STARS SERIES 2023 RULES January 1, 2023
10.1 DIRT only 36″ min 56″ max – length of right-side pod area with max 30o. Side pods not permitted on
IMCA body style.
10.2 Rear quarter distance from center of rear 20″ min 32″ max.
10.3 Cockpit cover with a max of ½” lip will be permitted providing the on/off cutoff switch is reachable from
outside the car by safety personnel.
10.4 Deck lid height from ground 30” minimum, 36” maximum.
10.5 DIRT Side pod may not extend rearward past the centerline of rear axle.
10.6 Body must be centered on chassis.
10.7 All body dimensions will have a tolerance of + or – ½”. Unless noted
11 MODIFIED LITE REAR SPOILER (DIRT Figure 10) (IMCA/ Figure 11)
11.1 A one piece, aluminum/Lexan spoiler with a maximum height of 4”-inches from the rear deck and 5”
maximum length will be permitted.
11.2 The rear spoiler must be non-adjustable from the cockpit and/or during racing conditions. Hinges,
adjuster(s), slides and/or any other adjusting type device permitted.
11.3 A brake and/or bend on the top of the aluminum/Lexan spoiler will be permitted for reinforcement.
11.4 The maximum overall height of the spoiler when measured from the ground must not exceed 40”-inches.
12 WEIGHT
12.1 All cars following the MODIFIED LITE STARS SERIES program must weigh a minimum of 1325
lbs., with driver after race.
12.2 No weight outside of car body, i.e., on nerf bars/rear end housings.
12.3 Hood will be clearly marked with cc displacement and minimum weight as outlined in Engine
Specification.
12.4 This weight program will be monitored for parity and competitiveness and may be changed at the
discretion of MODIFIED LITE STARS SERIES.
12.5 Attached weight must be securely bolted to frame with 1/2″ or larger bolts. Weight must be painted white
with car number displayed.
12.6 No weight above the deck.
12.7 Weight added to rear axle tubes will not be allowed.
13 BUMPER DIMENSIONS
13.1 Front maximum width 30″, Bumper height 6” to 8″ with 2-bar loop. Ground to top of bumper: 12”
minimum, 18” maximum. Bumper may not extend more than 30”” forward of spindle center. Refer to figure 3
and 7
13.2 Rear maximum width 56” with 3 vertical bars. Bumper height 6” to 8″ with 2-bar configuration. Ground
to top of bumper: 12” minimum, 18” maximum. May not extend more than 10” behind rear body panels.
13.3 Bumpers must be hollow with max wall thickness of .125
13.4 Front bumper minimum width will be 20”.
13.5 To ease pre & post-race inspection, easy to remove bumper/nerf bar connecting pins or bolts required.
