2021 SUPER STOCK CLASS DEMO DERBY RULES
Any car, age or model may be entered as long as it is not a pickup truck, El Camino, Ranchero, Convertible, Van,
SUV, Ambulance, Hearse, Limousine, Se-Dagon, pre- 1974 Imperial car or pre-1974 Imperial frame, 1970 or older
Lincoln, suicide Lincoln. You may run ‘03 and newer but no reinforced suspension.
Driver may maneuver forward or backward. No deliberate driver’s door hits. If a driver does not hit another
active car within one minute that car/driver shall be disqualified. No sandbagging. Cars must move when hit or
show visible damage. Driver must remain in his/her car with helmet on until car is removed from track or
officials tell you different. Make sure helmet strap is fastened. Helmet must remain won during competition.
Mandatory Car Rules
*All flammable material located in the interior of car such as the dash, head liner, seats, door panels,
insulation and carpet must be removed.
*All glass must be removed from the car including the head lights, side glass, front and rear glass,
taillights and all broken glass must be removed.
*The original fuel tank must be removed. A metal container or plastic fuel cell will need to be located in
the interior of the car; the tank must be mounted in the back seat area (mounting the fuel cell up off the
floor to the seat bar is highly recommended). Do not bolt the fuel cell to any frame or uni-body
components, must be floor sheet metal tin only. If you choose to use a plastic container it must be a fuel
cell, PLASTIC OR STEEL GAS CANS WILL NOT BE ALLOWED, IT MUST BE SAFE. No creative tanks to
reinforce the car allowed, period. Plastic fuel cells must be protected in a steel container on all 4 sides
except for the top side. All fuel cells must be covered to prevent the splashing of fuel in the car (rubber
inner tube or other non-flammable material is highly recommended for a fuel cell cover). 8 gallons of
gasoline fuel cell will be the maximum permitted size. The fuel cell must not leak. (No Exceptions). All
fuel lines located in the interior of the car must be covered for your safety. No Exceptions, Officials
decision is final.
*All cars must have a roof sign.
*Engine swaps allowed. Lower cradle allowed. May not reinforce car in any way. May not be any higher than
bottom of heads or more than 3” wider than engine block. Pulley protector allowed. No distributor protectors.
*May use mount of choice. May not be any larger than 8” x 8” mounting surface at engine saddle. Must stay at
least 3” from frame rails. May have two additional chains from engine to frame. May retain chains at frame on
top side only with 2.5”x 2.5” x .25” thick x 4” long angle. Only 2 tie downs allowed.
*Stock aluminum transmissions only. Transmissions must be period correct for cars allowed to run in this class.
No after-market housings. Aluminum ultra-bell allowed. May only attach with front pump bolts. No welding
allowed. No other form of tranny brace or reinforcement will be allowed. Simple skid plate on the pan allowed.
Coolers allowed. Mid-plate/ tranny adapter allowed. Must not extend more than 3” out from all transmission
bolt holes. May attach to front cradle. Must start with minimum 1” gap between firewall, sheet metal and midplate. Transmission tunnels must be covered if cut out.
AFTER MARKET BELL HOUSINGS ARE ALLOWED.
Transmission Cross Member
*Unaltered factory cross members allowed. 2” x 2” x .25” tubing allowed. This will be drilled. You may weld 8” x
2” x 2” angle to frame rails to bolt or weld cross member to. These must not reinforce car or frame in any way.
You must remove factory cross member mounts if using this method.
*Opened to any 5 lug or 8 lug single wheel. Axle protectors allowed. Bracing must not reinforce car in any way at
the start or end of the derby. Pinion brakes allowed. Call with any questions.
*No after-market coil springs. Double springs allowed. May chain springs to frame, but not to be welded. 3/8”
*7 leafs max. 2” stagger, measured from one end. 5/16” max thickness. No flat stacks. You may use 6 clamps
(FLAT STRAP ONLY- TWO 5/16” BOLTS PER CLAMP), three in front of housing and three in back. Max size 2” x 4”
x .25”. You may run one wrap of chain from frame to rear end, 3/8” chain max. Mopars are allowed to fabricate
leaf springs hanger brackets out of .25” thick 2” wide x 6” long to reposition the leaf springs underneath the rear
sub ( NO shortening the factory length of leaf springs).
Rear Control Arms
*Must be stock to make, model and year of car. No homemade allowed. You may reinforce all rear control arms
with maximum of 2 pieces of 1/8” x 3” x length of control arm flat strap max. Do not wrap control arms.
Watts Link Conversion
*You may convert a watts link to a standard 4 link system in the following way: Use the upper and lower trailing
arm brackets off an older Ford. No shortening of trailing arms, no positioning brackets to strengthen front down
legs of the rear hump or upper package tray. Must mount in the stock location or you may use upper mount tray
out of older car but must remove all of original factory package tray, the older style package tray you install
must not be welded anymore than a factory package tray and must stay at minimum ¾” away from hump
seam. Do not reweld seam. Welds may only weld to package tray. Or if you leave in the stock package tray, you
can use 4-piece bolt-in watts link conversion kit.
*Must be stock for cars allowed in this class. No alterations of frame mounts allowed. Zero after-market
components. Replacement ball joints allowed. No welding of ball joints. No screw in ball joints. No double
springs. No after-market springs. A-Arms may be welded down or chained. If welded, two 5/16” chains may be
used with no more than two links welded to spring bucket area/ or two 2” x 4” x 1/8” flat strap allowed per
upper a-arm. May not reinforce frame and go only to spring bucket area. Two per side allowed.
*Tie rods must be OEM for car allowed in class. Sleeves may be reinforced with weld only. No added material.
After-market steering columns allowed. All other components must remain stock for cars allowed in this class.
Bumpers and Brackets
*May load/reinforce any bumper that has front and rear skins. Do not reshape, pound flat or mold front or rear
bumper skin. Must look identical to factory bumper. Only reinforce inside of bumper. May plate over turn signal
holes on front skin. Bumper skin may be welded to backing liner. An 8” x 8” flat plate may be added to bumper
backing, to weld bumper to frame. Factory bracket or 4” x 3/8” plate may be used. May be welded to one
location of frame only (top, bottom or side). May not extend any further than 14” onto frame. May make an “L”
at bumper to weld bumper onto frame. The bumper may be built up to have a 14” point from the farthest point from the back side of the bumper to the point over a 36” span and 8” tall.
HOOD & HOOD FASTENERS (8 total)
*Stock hood hinges do not count as 2 fasteners.
*Front all-thread 1” maximum may go through the frame and hood along radiator core support on each
side and is counted as two fasteners.
*The other 6 hood hold down bolts must be sheet metal to sheet metal only and a maximum size/ max of
¾” all thread only. You may use a 5” x 5” x ¼” plate welded in the front corners of core support and
firewall corners under the hood to thread you hood bolts to. Or a 3” x 12” x ¼” strap in the corners to
thread you hood bolts to. Bolt may only be welded vertically to this plate for more secure hood bolt
mount. This was originally intended for cars that did not have inner fenders, or only had plastic inner
fenders and now all cars may do this.
*Plates may be used as washers on the top side of the hood for hood bolt down bolts. The maximum size
of hood washer or plate is 6” x 6” on all eight of the hood hold down bolts.
*You may weld a 5” long piece of 3” x 3” x ¼” thick angle iron to the hood and fender in place of all
thread. These angle irons must be welded the side of hood and fender only. These two pieces of angle
iron may be bolted shut with a maximum of one ¾” bolt per angle iron bracket and this method counts
as one hood fastener. You may use 6 angle iron mounts, stock hinges and two all thread at radiator
support (8 fasteners total allowed) or 8 all thread and stock hinges with not angle iron (8 fasteners total
as well). Use any of the above explained hood fastener methods but 8 is the maximum allowed per
*IF YOU CHOOSE THE ANGLE IRON METHOD TO HOLD HOOD SHUT YOU MAY NOT USE A 5” PLATE TOO,
JUST ANGLE IRON.
*Drivers doors can be welded inside and outside seams for safety and may also have outside door brace on the
door skin. Outside door brace must be flat steel only and must conform to the shape of the door skin. This door
brace may be welded or bolted to the driver door skin (welding is highly recommended). This door brace may
not be more than ¼” thick and must not extend more than 6” ahead or behind door seams max. (No grader
blades, round pipe, square tubing or C channel allowed for outside door brace it must be flat metal only).
All exterior door seams may be welded solid. Must use no larger than 4” wide x 1/8” thick flat strap maximum
welded per door seam.
No extra bolts inside doors. Top of door seams may be folded and welded. No added material.
Windshield Bars/ 9 Wire
Must have one windshield bar 2” x .25” max. Only 6” attached to dash and roof maximum of 2 bars. Two spots
of 9 wire per side window. Four wraps may go around frame.
*May be pre-cut and bolted back together with eight 3/8” bolts per fender, but not re-welded.
*Exterior body creasing is allowed. Do not weld, wire, bolt or screw the body crease and no other exceptions.
Trunks and tailgates on fresh cars and wagons may either be tucked with the 50/50 rules or wedged as
explained below but not both. 50% of lid must remain in stock location if you tuck. The tuck will be measured
from the front most seam to the first rear seam to determine the 50/50 rule. If you wedge your trunk lid it may
be beat down. Nothing that is town away from stock location can be welded or bolted back. A 12” inspection
hole will have to be cut in the top of trunk lid for inspection and rear quarters must remain in 100% stock
location if you choose to wedge. Trunk lid must remain 10” off the floor pan above the frame rail. Wedged
sedans and hard tops must have nothing bolted or welded from the deck lid to the floor pan or frame other than
you 2 sticks of all thread. May weld to side of frame, 100% vertical only and 1” max all thread. May go through
trunk lid only (no roof or speaker panel).
10 x 10 sheet metal rust patches allowed--- call on location
Excess rear quarter panels may be folded in towards trunk lid/ pan and bolted with four 3/8” bolts or four 1”
long weld beads per rear quarter panel.
Tucked trunk lid may be bolted not welded to the floor pan with four 3/8” bolts only. Trunks can be welded solid
using 1/8” x 4” strap.
*The front two radiator mounts may be removed and have up to 1” maximum all thread installed through
the frame along each side of the radiator core support to replace these mounts.
*Must have minimum of 1” space between frame and radiator support and body to frame (You may
remove factory spacer and replace with a solid spacer, but the spacer must be the factory width).
Radiator support cannot be pulled down contacting the frame without a spacer and no welding radiator
support to the frame. Tilted cars will naturally have a taller than factory core support spacer and a max
of 2 ½” in diameter x ¼” thick square or round spacer may be used. May only weld this spacer to the top
side of the frame and must not be welded to the core support or vertical edges of the frame.
*Two mounts in rear trunk lid or wagon can be installed with up to 1” all thread maximum size allowed.
These two trunk lid mounts or wagon all thread may go down through the frame and be bolted only.
May weld 100% vertical to the frame.
*For safety all other body mount bolts may be changed with up to 5/8” maximum size bolts and may not
go all the way through the frame, just bolted to the factory location inside the frame. These bolts may
only replace the original factory bolts. Do not weld body bolts to the frame, body or spacer. Don’t be
surprised if we ask you to loosen body bolts to ensure they are not welded to the frame. No adding of
body bolts where there were not bolts before, except for 2 extra bolts in the speaker deck above the
humps of rear frame rails. These 2 additional bolts may only go through the shock tower area of the
frame and car body sheet metal where from the factory on most cars where there was only a body
isolator but not a body bolt.
*The body spacers must be at least factory thickness, if original spacer is not useable a ½” minimum thick
body spacer that is 2 ½” in diameter max may be used only. Rubber hockey pucks, washers etc. are all
ok. Welding body spacers to frame and/or body is not allowed.
*The only bolts allowed to go through the frame completely are the two 1” all thread at the radiator core
support and the two 1” all thread going through the trunk lid.
*5” square or round maximum sized washers allowed to hold body mounts to the interior floor. 5” square
or round washer max for all thread hood bolts and trunk lid and wagon all thread bolts as well. Do not
weld these body washers to the floor tin, frame or mount any interior brackets to these body washers.
Drivers Door & Net
*A driver’s door window net is allowed for safety (this is optional, and a steel window net is highly recommended
but not required). The window safety net may only cover the driver’s door window area. This window net must
be sheet metal to sheet metal only connecting to the top of the window on the driver’s door and the edge of the
The driver’s door seams may be completely welded shut for safety on the exterior seams and extra door plate
may not extend more than 6” past driver’s door seam front and back of the door. 1/8” x 4” wide flat strap or ½”
rod is maximum size allowed for welding driver’s door seams. Sedan cars may weld the driver’s door window
bracket to the post/pillar and roof. Officials decision for safety of the door is final, it must be safe.
*Firewall may be cut out, but not reformed or relocated.
Brake/ Gas Pedal
*May not reinforce floor pan in any way or come in contact with body mounts.
Cage/Rollover/Gas Tank Protector
*You are allowed two sidebars 60” long x 6” diameter max. One dash bar and one seat bar 4” x 4” max material.
Two down legs per side to sheet metal only. Must be inside of inner door seams. One rollover bar required. 4”
max diameter material. May weld to top of frame only. Must be minimum of 8” away from any body mount bolt.
Gas Tank protector 4” max diameter, 30” wide, straight back off of rear seat bar. NO EXCEPTIONS. May extend
upwards, must be a minimum of 8” from roof. May extend one bar forward to halo bar, no larger than 2” x 2”
tubing. Must be in straight line. 2” minimum gap from rear seat sheet metal. If sheet metal is moved or
reconfigured in any way, you will be required to have a 4” gap from package tray. NO EXCEPTIONS.
Wheels and Tires
*Wheels may have valve stem protectors and oversized lug nuts are allowed. TIRES ARE UNLIMITED- any ply,
meaning forklift tire, tractor tire, skid steer tire and double side wall are all ok. 15” tires maximum.
All wheel weights must be removed from the rims before running. Weld in wheel centers are allowed on rims
but may not exceed 8” in total diameter. Solid rubber or foam filled tires are allowed, along with valve stem
protection. 1” oversized lug nuts are allowed. 8” weld in wheel centers max are allowed on 5 lug rears and 9” on
8 lug with no other rim reinforcements. These 8” wheel centers will be measured from the center of the
hub/axel and must not exceed more than 4” in diameter from these either these locations. No bead lock or full
disc wheel centers will be allowed.
*Frames may be shortened up to 1” from front side of core support frame hole. If any shorter…you will NOT run.
No weld anywhere on the car or frame may exceed ½” wide. NO EXCEPTIONS. A-arms forward top seam only
14” long total. Bumper bracket may be welded. One side of frame only. 12” of weld behind A-arms/ for tilting or
repair seams. Zero homemade seams. Do not reform the tabs on Ford boxes…they will be cut.
Two pre-plates, 6” x 5” x 1/8”, allowed. Must be 3” from any other bracket, plate or strap that was placed on the
We will allow two additional repair plates after the heat. Unlimited 9 wire allowed for repairs.
ALL OTHER COMPONENTS MUST REMAIN STOCK. DO NOT TRY TO READ AROUND THESE RULES. IF YOU HAVE A QUESTION ASK! WE ARE UNABLE TO INCLUDE EVERYTHING THAT YOU MAY THINK OF… CALL BEFORE YOU TRY IT.
ANY QUESTIONS CALL OR TEXT DEAN AT 785-425-8432.