Race Office 559-507-9931
Madera Super Late Model Rules
Driver Eligibility - Drivers in this division must be at least 14 years old. Drivers that have won a minimum of five (5) races in the 51FIFTY Jr Late Model Series are eligible to compete in this series. There is no membership required for this division. Note, any driver under 16 years of age must submit a resume and apply for approval for the series.
Competing models - Open to any made for asphalt racing late model perimeter or straight rail tube frame chassis. Chassis Conventional made for asphalt racing, late model perimeter or straight rail chassis. Refer to USRA for chassis specifications. (United Super Late model Rules Alliance).
General body rules - 5 STAR or AR BODIES asphalt late model traditional ABC or new style body, or AR BODIES asphalt late model muscle car body. Bodies must be mounted in compliance with standard mounting procedures as spelled out in the manufacturer’s catalogs. No additional or add-on panels, extensions or modifications to the factory panels will be allowed. No modifications of front or rear bumper covers will be allowed. No additional holes or cut outs other than for front brake ducts and radiator cooling. Maximum 3/4” tall roof rails will be allowed. Rails may not extend past the roof. (No rails allowed on the rear windows or rear deck etc.) Right and left front vent windows extending no further than 12” back with a 1”max. Bulge will be allowed.
The following body measurement dimensions are required (Minimum nose, body and frame height is 4” with a maximum of 8” while in tech for the purposes of tech inspection.)
Roof height will be 47” minimum as measured 10” back from the top of the windshield in the center.
Front nose overhang will be a maximum of 46” as measured from the centerline of the front hubs to the farthest forward point of the car.
Rear tail overhang will be a maximum of 47” as measured from the centerline of the rear axle to the top rear of the bumper cover at the base of the spoiler.
Maximum rear quarter panel height 34.5” measured at the top of the R & L quarter panel at the base of the spoiler.
Maximum rear spoiler width is 60”. Maximum height allowed is 6 ½” measured from the base of the spoiler at the rear deck to the tallest point. Spoilers must be mounted no further back than the rear-most top of the tail. Spoiler must be centered on the rear body. No offset mounting of spoilers allowed. There are no forward braces or end plates or wicker lip edges allowed. Spoilers must be constructed of clear poly carbonate to allow visibility through for competing drivers.
All interior panels shall be aluminum or steel and completely seal the driver’s compartment from the engine compartment and fuel cell area.
Only one naca-duct in either the left or right quarter window for helmet blower only.
Weight - All vehicles will be weighed prior to qualifying and the main events or as requested by track tech staff.
All added weight shall be painted white with the car number written on all pieces. Must be at least 5lb. blocks securely bolted to a main frame rail with ½” bolts or secured inside weight boxes. No weight blocks inside the driver’s compartment.
Vehicle weights and left side percentage requirements are as follows.
Open Engine Package – Cast iron block with gauge legal 750 carburetor / 2,800 pounds with 58% left side weight.
Seal Alliance Builders 604 or Las Vegas Super Late Spec Engine Package – any 650 cfm carburetor or Gauge legal 750 carburetor / 2750 with 59% left side weight.
OEM Stock Factory Sealed 604 crate engine package – Any 4-barrel carburetor allowed / 2,700 pounds with 60% left side weight.
Engine Set Back – Cars with a distributor at the rear of the engine is up to 2" back, at the center of the forward most spark plug hole to the center of the upper ball joint on the same side. Cars with the distributor at the front of the engine is up to 4" back, at the center of the forward most spark plug hole to the center of the upper ball joint on the same side.
Suspension -
1. No fifth (5th) coil or lift bar suspensions will be permitted. No birdcage set-ups of any kind (3 or 4 link). Trailing arms must mount to rear end in a solid fashion (heim allowed) and no part of the trailing arm mounting may freely rotate around the rear end. All parts of rear suspension must be solid, one-piece construction with no moving parts, with one heim at each end. All mounts for trailing arms, third links and track bars must also be solid and may not have the ability to move.
2. Minimum wheelbase of 101” with maximum of 105”. The difference from left to right may not exceed ½ inch.
3. Track width will be measured sidewall to sidewall bulge, at spindle height, in the front is a maximum of 80”, 66” maximum tread width measured on the referee.
4. No in car driver adjustments other than one adjuster for brakes.
5. Coil Springs and Spindles must be Steel. (Exception: approved Coleman Spindle)
6. One shock per wheel. Shocks must be only mechanical in nature and no part of the suspension or shocks may utilize electricity. No inerter-style dampers, aka “J damper” shocks allowed.
7. Maximum one coil spring and one bump spring associated with each wheel.
8. No hollowed-out or gun drilled bolts of any kind allowed on suspension components.
Brakes –
Vehicle must be equipped with four-wheel hydraulic brakes.
2. No carbon fiber or titanium rotors. Only steel rotors are allowed.
3. Brake fluid circulators permitted. Liquid or gas cooling not permitted.
4. Two brake hoses per side with a maximum diameter of 3" each are permitted. Must attach to a spindle mounted duct only.
5. Fans, ducts or hoses to the rear brakes will not be permitted.
Ignition - HEI or aftermarket distributor may be used.
1. Battery powered ignition required. Vehicle MUST start under own power.
2. Max.16-volt battery. Must be securely mounted outside the driver’s compartment. Car must be able to start with a 12-volt battery. No Mags.
3. The Quick Car part number #50-2053 spec wiring harness is recommended (mandatory in 2025). All wiring must be sealed. No unplugged wiring. All ignition boxes must be mounted on the passenger side, in plain view, and out of reach of the driver…and…all wires to the distributor must be run separately and not part of a bigger loom or wiring harness.
4. Approved ignition boxes used only as produced on original plate. Mounted on the right side of the car with dials pointed out the passenger window.
1. Crane Fast Ignition part #6000-6701
2. JMS-Daytona Sensors Part #6000-6701K
3. MSD part #6427 6CT
Officials reserve the right to exchange boxes at any time.
5. No Traction Control Devices of any kind - If any 'traction control' device is found, the driver and owner will be disqualified from the event, the car will be confiscated until a $5,000 fine is paid. Additionally, the driver/owner may receive a lifetime ban.
Exhaust system and noise requirements
Mufflers, single or dual, are mandatory and shall be sufficient enough to meet all sound requirements of Madera Speedway at all times. 95db at 100’ is the sound requirement.
Drive Train
May use a Ford 9 inch or Quick change rear end. Gun drilled axels are allowed. Must be magnetic steel axles only, no titanium axels allowed.
Magnetic steel or aluminum drive shaft may be used. (No carbon fiber) Must be painted white. Front and rear drive line safety loops are required.
Any external clutch manual transmission is allowed. Must have at least (2) working forward gears and (1) working reverse gear. A full containment style bell housing is required.
Wheels and Tires
1. Wheel max width is 10”. Wheels, lug nuts and studs must be steel.
2. Bleeders are not allowed.
3. Use of tire softening or altering agents will not be permitted. Use of such substances will result in immediate disqualification, loss of points and money.
4. Air may not be blown or forced onto the tire or bead.
5. May run offset wheels as long as track width requirements are met.
Tire rule is a maximum count of eight (8) tires per car for the race weekend. MUST RACE SAME 4 TIRES YOU QUALIFIED ON.
Fuel and Fuel Cell
1. Fuel cell must be mounted in a minimum structure of 1”x 1” square steel tubing with a minimum thickness of .065” (.000 tolerance) attached to the frame with a minimum of 0.375” bolts.
2. The fuel cell must be encased in a container of not less than 22 gauge (0.031” thick) magnetic sheet steel.
3. If the fuel cell container has a bolt on top, it must be bolted together with minimum 3/16” diameter bolts.
4. The bottom support frame must be constructed using a minimum of two (2) straps, 1 ½” x 0.125” minimum thick magnetic steel or 1”x 1” square steel tubing with a minimum thickness of .065” (.000 tolerance). These supports must be welded to the fuel cell front and rear cross members. The support straps must extend down the front and rear equally spaced and under the fuel cell container.
5. A racing fuel cell is mandatory with a maximum 22-gallon (US) capacity. Fuel cell must be constructed with a steel outer can (22-gage steel strongly recommended) and an internal rubber safety bladder.
6. A reinforcement plate must be installed front and rear of the full cell. These plates may be constructed of 11 gage steel (Strongly recommended) or aluminum (.125” thick). The plates must extend the entire height and width of the fuel cell container and be securely welded in place or bolted (minimum 3/16” diameter bolts) with a minimum of two (2) bolts on each side.
7. Fuel cell must have a minimum of eight inches (8”) clearance.
8. All cars must have a safety bar at the rear of the fuel cell.
9. At a minimum, all fuel cell configurations must include a rubber type cell in a steel container. No “U” shaped Fuel Cells or non-standard shaped fuel cells. Fuel cell sides must be symmetrical.
10. The front side of cell is to be no closer than 10” to the back of the rear end tube.
11. 110 Sunoco or Sunoco E85 Fuel Only
Safety Requirements
1. A professional grade aluminum made for racing seat is required. Shoulder, head, and leg supports are strongly recommended on all seats. Absolutely no plastic or fiberglass seats of any kind will be allowed. The seat must be securely mounted to a steel frame and brackets welded to the main roll cage. Seat shall be bolted to the mounts with minimum 6 - 3/8” grade 8 bolts and large washers to prevent pull through.
2. SFI certified racing seat belts and harness are required. A minimum 3” wide strap (narrowed for Hans device ok) 5 or 6 point harness with individual double shoulder belts shall be required (no “Y” type). Seat belts should include an anti-sub belt to prevent the racer from sliding forward under the lap belts. Seat belt sets may not be more than 3 years old per the SFI tag. Belts with missing or unreadable SFI tags will be required to be replaced. Seat belts will be securely fastened to the main roll cage with welded tabs and minimum ½” bolts. Seat belts bolted directly to the floor pan will not be allowed. Shoulder belts should be anchored 6” below the shoulder line by either bolting or securing around the spreader bar with the proper hardware.
3. Snell approved SA2010 or newer full face racing helmet with polycarbonate shield or goggles is required. A missing or unreadable Snell or SFI label will require recertification or replacement of helmet. SFI head sock is strongly recommended.
4. A Hans other similar SFI approved head and neck restraint is required to be warn at all times while on the track.
5. SFI certified racing suit is required for all drivers at all times on the track. Damaged drivers suits with holes or tears will be required to be replaced. SFI rated gloves and shoes are required. Fire retardant long underwear is highly recommended.
6. An on-board fire suppression system is mandatory. System shall have a minimum of a 5 lb. extinguisher in an approved secure mounting bracket. Must be mounted inside the driver’s compartment either under or behind the driver’s seat. System must have a minimum of 3 operational nozzles, 1 at the rear of the engine, 1 over the fuel cell and one in the driver’s compartment facing the driver from just under the dash area.
7. Ribbon style window net is required on the driver’s side window. Mesh window nets are not allowed. Must be securely fastened to the top door bar at the bottom and have a quick release latch at the top that is easily accessible to both the driver and track safety crew.
8. Two-way radios are mandatory. Spotter and crew must be able to communicate with driver by radio at all times while on the track. A designated spotter is mandatory and will be required to be present in the spotters stand at all times during the event. Any car without a spotter in the designated spotters stand may be black flagged from the event.
Additional Rules
1. Titanium, Inconel, or exotic metals are not allowed for use on the race car unless specified.
2. No Data Acquisition equipment/wiring is allowed in the car on officially recognized race or practice days.
3. No digital dashes allowed.
4. Cellphones, smart watches or Bluetooth devices will not be allowed in racecar at any time during qualifying or race, this is an automatic disqualification.
5. Scoring transponders must be placed on the right rear frame rail 160” from the leading edge of the nose.
6. No cool down units, pumps, exotic fans allowed.
7. Cars will be weighed with the driver prior to or after the feature. Reading of designated scales will be official.