Enduro Rules

The enduro races are put on by the Iowa Sportsman Series. If you have any questions about these rules, please reach out to them.


1.1.1 Cars must have numbers on both doors and roof and must be clearly visible. Car Numbers are on a first come first serve basis. Member’s car numbers are reserved. No
Letters. No duplicate numbers. Non-Member numbers have to be over 100. No
Exceptions. No flags on cars.
1.1.2 Minimum wheelbase is 107 inches.
1.1.3 Must use a collapsible steering column. A center steering wheel pad is
1.1.4 Hood and trunk must be pinned shut.
1.1.5 All doors must be chained, welded or bolted shut.
1.1.6 Rub rails are allowed, 1 ½ X ½ max.
1.1.7 All glass must be removed. Wire screen and bars are required in front of driver’s side.
Headlamp, side marker lamps, turn signals, tail lights and all chrome must be removed.
No lights of any kind, except for an optional brake light in back window.
1.1.8 Racing seat constructed of at least .125 aluminum is mandatory.
1.1.9 Seat must be secured by at least four 3/8” bolts, two in front and two in the back .Must
Use large washers (11/2” diameter) on the aluminum side.
1.1.10 must be fastened to the roll cage or the frame structure. No fiberglass seats.
1.1.11. 4 or 5 point racing seat belts with lap belt and shoulder straps are required.
1.1.12 Safety belts must be mounted per Manufactures recommendation. Shoulder harness
Should be run through a welded loop behind driver’s seat.
1.1.13 Restraint system must be securely attached to the roll cage structure. Window net or
arm restraints are mandatory.
1.1.14 Belts and window nets are highly recommended not be older than 3 years old. If they
are older than three years of age they need to be in good shape. (no frayed areas)
Will be checked before each race.
1.1.14 Full fire suit and full face helmet are required. Neck brace and gloves are
1.1.15 Must pass official prerace inspection or you will not be allowed to race.
1.1.16.Helmet must be Snell 2000 or Snell 2005 approved. No DOT Helmets.
1.1.17 Inside must be gutted (seats, door panels, headliners, plastic or any other
flammable material).
1.1.18 Complete bumper to bumper uni-body must remain in tact.
1.1.19. Front and rear bumpers are required and must be chained or welded. This must be
done before you can race. Bumpers must be capped on the ends.
1.1.20 Battery can be mounted under the hood, trunk. Battery must be securely fasten down.
1.1.21 Radiator maybe aluminum or brass.
1.1.22 Weight may be add to the car.(unless stated by option #3)
1.1.23 All weights must be painted white, have your car number on it, and must have two ½”
bolts per weight and double nutted no exceptions. (this will be enforced and if the
inspectors feel that a weight isn‘t securely fasten down they can and will make the racer
take it out before the race.)
1.1.24 No extra cooling devices of any kind. (cool cans, external radiator cooling device etc.)
1.1.25 Tranny coolers are allowed but they can not be mounted in the driver’s compartment.
1.1.26 Bodies must be stock appearing.
1.1.27 No after market parts are allowed unless stated in the rules.
1.1.28 All drivers must be 16 years of age and have a letter of approval signed and notarized
on file for that track to be able to race there.
1.1.29 No offensive lettering or material.
1.1.30 Kill switch Optional within the reach of the driver. Switch need to be clearly marked
ON and OFF.
1.1.31 A tow hook is needed at the front and rear of the car for the wrecker to hook to.

1.2.1 Must use stock lower A-arms and stock location on lower mounts.
1.2.2 Must use stock trailing arms and stock location on mounts.
1.2.3 If it came with leaf springs, then has to retain leaf springs.
1.2.4 Spindles must stock.
1.2.5 All steering components must be stock. (no rack and pinion ) Steering column can be

1.3.1 Must be operating on all four wheels and must lock up all four wheels.
1.3.2 Must have caliper and rotors or drums or any combination of the two on all four
1.3.3 No electronic actuators allowed.
1.3.4 Stock rotors or drums only.
1.3.5 Calipers need to be stock cast iron .

1.4.1 Bead lock right rear only
1.4.2 15 X 8” rim maximum
1.4.3 Racing tires are allowed
1.4.4 No snow, mud or recapped tires.
1.4.5 One inch lug nuts are recommended.

1.5.1 Stock, nine inch ford or a floater rear end.

1.6.1 Must remain stock from front of the steering box to the center of the rear axle.
1.6.2 Lower A frame mounts and rear trailing arm mounts must be stock location .

1.7 CAGE
1.7.1 Must be a four point cage that is connected to the frame, with two post in front of the
driver and two post behind. Must have the three vertical driver bars minimum ½” in
diameter between the dash bar and the halo bar. A front hoop is allowed. No bars can be
added in front of the radiator, except bars that are for the front bumpers.

1.7.2 Behind the driver’s seat back you can add as many bars as needed or wanted. Tubing
must be at least .095 X 1.75 steel. Three drivers door bars are required. Three passenger
side door bars are recommended. Horizontal drivers protection bars are required.

1.7.3 Body sheet metal must be kept in place at all time. No galvanized pipe allowed. A steel
plate 3/16 minimum welded to the driver’s door bars is required. Installation and
workmanship must be acceptable to race officials. NO ROLL CAGE…NO RACING!
Promoter/series inspector have the right to refuse any car from racing.

1.8.1 No loose objects and or weights are allowed in the driver compartment.
1.8.2 Padding is required . Any place a driver can touch when belted in the seat needs to be

1.9.1 Must be mounted in the trunk area only.
1.9.2 Can not be any lower than eight inches off the ground.
1.9.3 No bigger than 32 gallons and must be in a steel can that is supported by the frame.
1.9.4 Can not be mounted to the trunk floor pan.
1.9.5 Fuel cell must be inside of the frame rails.
1.9.6A complete fire wall made of steel must be used to seal off the trunk area from the
driver. No holes in the trunk area are allowed except for hood pins.
1.9.7 If the fuel lines goes through the driver’s compartment it must be inside a steel tube that
is one piece.
1.9.8 No electric fuel pumps of any kind.
1.9.9 If the fuel line is run under the car it must be steel braided or run in a steel tube.

1.10 FUEL
1.10.1 No performance enhancing fuels
1.11.1 IMCA Crate engine or 360 CI Spec engines allowed
1.11.2 Stock carburetor or 4412 style .
1.11.3 No roller cams.
1.11.4 Cast iron heads
1.11.5 Must use cast iron block.
1.11.6 Vacuum must be fourteen inches at one thousand rpm’s, If you can’t pull fourteen
inches of vacuum you must run the 350 cfm Holley two barrel.(unless otherwise stated)
1.11.7 There must be a port on top of the motor to check vacuum. You need to have this on
the motor at all times so there is no waiting.
1.11.8 2 or 4 barrel carburetor , choke plate may be removed.
1.11.9 No claim

1.12 Option #2
1.12.1 May use 602 GM Crate Has to remain sealed
1.12.2 Hobby stock rules or Sport Compact must follow weekly rules

1.13.1 Automatics must have a 10” working converter or larger.
1.13.2 Manual transmissions must have a steel bell housing .
1.13.3 Manuals must have all gears and must work.
1.13.4 Stock style 3 or 4 speed transmission ( no Brinn or Falcon transmissions) .
1.13.5 Flywheels will be steel stock style. ( 7 ¼” or larger)
1.13.6 Drive shaft needs to be painted white.
1.13.7 Must have a drive shaft loop or chain.
1.13.8 No internal clutches.

Red flag : come to a slow stop on the track. The pits will be closed at this time. If you
enter the pits you will be docked five laps the first time.
Yellow flags will be used. Caution lap pace will be at idle speed. During caution laps all
cars need to be single file at all times . There will be no passing of cars on caution laps.
Caught passing cars on yellow flag laps you will be sent to the pits for two laps per car
that is pasted.
At no time will the driver get out of there car on the track unless instructed to do so by a
track personal.
At each track there will be a place to enter and exit the pits. All pit crew members are to
stay off the track during the race.
After the race all cars are to remain on the front stretch , a race official will tell you what
to next. At no time will you do anything to your car. You may cool down your car as
long as you do not remove the hood. If you mess with your car you will be DQ.
All decisions made by the officials are final. No use of alcoholic or any other illegal drugs
No three wheelers or golf carts used by the race teams.
There will be a pre race safety inspection. All racers need to be at the track at least one
hour before the race for inspections. If car is found to be unsafe they will not be allowed
to race.

If you think a car is illegal you can protest. You need to give the inspector one hundred
dollars and the car number. If the car passes then the car in question will receive the
money, And if the car fails then that car will be DQ , And the driver that protested will
receive their money back.

1.Only the driver and one pit crew member are allowed to be in the pit area. Anyone else
will be asked to leave.
2. Also in the tech area you will need tools to pull spark plugs, check vacuum, removal of
the valve cover.
3.You are not allowed to work on or remove any part of the car until told to do so by the
tech official.
4.Only the top five will be inspected.
5.If for any reason we have to wait more than five minutes on a car to do a tech inspection
( no vacuum port or tools for removal of said parts, that car will be DQ.
6. Failure to meet any of the above rules will result in disqualification.

The Iowa Sportsman Series reserves the right to change or adjust any of the rules at any
time to enhance competition and car counts. Revised 6/20/2016