These rules are in effect as of July 15, 2007. This publication supersedes all previous I-10 SPEEDWAY rules and rule updates.

I-10 SPEEDWAY reserves the right to alter or amend the rules and regulations in the interest of safety, cost control, and/or fair competition. ADDING WEIGHT, REQUIRING THE LOSS OF LEFT SIDE PERCENTAGE, OR REQUIRING A CARBURETOR RESTRICTION PLATE ON A VEHICLE WILL BE TOOLS USED BY I-10 RACEWAY OFFICIALS TO MAINTAIN FAIR COMPETITION. It is the responsibility of each competitor to read and understand the contents of these rules. If there is a disagreement or dispute regarding the meaning or application of these rules, the decision of the I-10 SPEEDWAY Race Director shall prevail.

No expressed or implied warranty of safety shall result from publications of or compliance with these rules and/or regulations. The rules and/or regulations set forth herein are designed to provide for the orderly conduct of I-10 SPEEDWAY 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 pretense is made for having designed a foolproof set of rules and regulations. The spirit and intent of the rules is the standard by which I-10 SPEEDWAY events will be governed. The I-10 SPEEDWAY Race Director is authorized to decide if an equipment change or modification is an attempt to circumvent these rules. The I-10 SPEEDWAY Race Director can and will disqualify a race car in violation of the spirit and intent of these rules. If this rulebook does not specifically state that you can alter, change, or otherwise modify something on your car, you should consider it a violation of these rules. No part is deemed to have been approved by I-10 SPEEDWAY by passing through prior technical inspections.

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 Race Director. His/her decision is final. These rules 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. All participants, guest and crew members fully understand that racing is inherently dangerous and that they are exposed to risks of death or serious bodily injury. The participants, guest and crew members voluntarily assume these risks.


A. This class is open to most American-made passenger car production sedans, and coupes. No pickup trucks, station wagons, convertibles, or Jeeps allowed. American-made passenger car bodies only. If there is a question whether a body type is permitted, submit a written request to I-10 SPEEDWAY for tech approval.

B. All bodies must be as close to stock appearing as possible with the body being used. All body parts must be made of steel, aluminum, or fiberglass. Carbon fiber and/or kevlar components are not permitted. Flat or slab sided bodies are permitted.

C. The nose and grill area may be cut for the installation of air ducts only. The rear bumper or bumper cover may not be altered, modified or drilled. A full rear filler panel is required.

D. The roof must be located in the stock position. All other body parts must be securely attached without any sharp edges.

E. Belly pans are not permitted.

F. Approved front air dams must have a minimum of three (3) inches of ground clearance.

G. Interior of the car must be totally isolated from the engine compartment and fuel cell area with firewalls constructed of a minimum of 20-gauge steel. Aluminum firewalls are not permitted. All holes in the firewalls must be sealed. The interior floor of the car must be completely sealed and constructed of a minimum of 20-gauge steel or approved material.

H. Hood must be even with the top of front fenders and completely cover the air cleaner and carburetor. A rearward opening scoop is permitted with a maximum height of four (4) inches and a maximum width of twenty-four (24) inches.

I. Rear spoiler height may not exceed six (6) inches, measured from any point along the deck lid to top of spoiler. Rear spoiler may be a maximum of sixty (60) inches wide.

J. All other body modifications must meet with prior tech approval.


A. This is a late model class with weight penalties that balance the field of cars with other tracks and chassis dimensions.

Late Model base weight, 2900 lbs. 58% left side, with ASA, Irwindale, Mesa Marin, Spec-Motors, Chevy-Crate Motor, 604.


1. Lower control arms, not stock. Add 50 lbs plus the loss of 1% left side.

2. Wheel base less than 108. Add 50 lbs plus the loss of 1% left side.

3. Rack Steering. Add 25 lbs.

4. Spindles, not stock. Add 25 lbs.

5. Wide 5 hub and wheel. Add 25 lbs.

6. Non spec or crate motor. Add 50 lbs plus the loss of 1% left side.

7. Not stock front stub, or approved front replacement clip. Add 50 lbs plus the loss of 1% left side. (Approved front clips, Port City Racing, CMJ Racing, Race Car Factory and Victory Circle).

B. Maximum treadwidth is 68 inches measured at center of tire.

C. Stock front frame car must have a minimum of the stock frame 8" forward and 10" rearward of the front spring buckets. Wheel base minimum 108 in. plus or minus ½ in. Any car with shorter wheel base must add 50 lbs plus the loss of 1% left side.

D. Maximum rear weight percentage on all cars is 52% (percent).

E. All weights are for car and driver on I-10 SPEEDWAY scales.

F. The frame rails, body and all added lead weight must maintain a minimum of three (3) inches ground clearance, with the driver in the car. All cars must maintain a minimum of eight (8) inches of ground clearance measured at the bottom of the fuel cell can. There must be a minimum of three (3) inches of ground clearance at the oil pan.

G. All added weight that is not contained in the frame rails or in steel tubing welded to the frame, must be in minimum five (5) pound blocks, must be painted white, must have car number clearly visible on each piece, and must be securely attached with a minimum of two (2), 1/2 inch grade five bolts.


A. Independent rear suspension is not permitted. Coil over suspension is not permitted. Minimum coil spring diameter is 4½ inches. Leaf spring suspension is permitted. Shocks cannot be in center of spring.

B. Minimum coil spring diameter is four and one half (4 1/2) inches. Bottom coil spring mounts must be located on the lower control arm and top mount must be securely attached to the chassis.

C. All control arms must be constructed of magnetic steel. Aluminum cross shafts are permitted.

D. Tubular lower control arms are permitted, must add 50 lbs to car and plus the loss of 1% left side.

E. OEM or tubular upper control arms are permitted.

F. The rear springs must be mounted in the same manner on each end of the rear end housing.

G. Static weight jacking devices are permitted. No weight may be moved while the car is in motion or on the racetrack.

H. Shocks may not have external reservoirs. Only one shock per wheel is permitted. Adjustable shocks are permitted.

I. Shock body and shaft must be made of steel, no aluminum.


A. A NASCAR approved quick release steering wheel is required.

B. Steering columns must be collapsible. U-joints are acceptable.

C. Rack and pinion steering is permitted, must add 25 lbs.

D. All steering heim joints and tie rods may be constructed of magnetic steel or aluminum.

E. All welding of steering components must meet with I-10 SPEEDWAY approval.

F. Steering wheels must have a two inch thick pad in the center.

G. Spindles, Stock OEM front spindles. After market spindles must add 25 lbs.


A. Eligible engines will be production engines as determined, selected, and approved by I-10 SPEEDWAY. I-10 SPEEDWAY must approve all major engine component parts prior to their being used in competition.

B. SPEC ENGINE OPTION: ASA, Irwindale, Mesa Marin and Chevy Crate Motors are the only motors that do not have a weight penalty. All other motors must add 50 lbs plus the loss of 1% left side.

C. Engines may be interchanged within any corporate manufacturer's line.

D. Only stock, OEM, cast iron engine blocks are permitted. Aftermarket engine blocks are not permitted. The engine block must retain all stock external dimensions, excluding maximum allowable overbore. Angle cutting the engine block deck is not permitted.

E. Maximum engine displacement is 361 cubic inches including wear.

F. Maximum engine compression ratio is 11:1.

G. Any round aluminum piston may be used. A minimum of three (3) rings per piston is required.

H. No titanium is permitted in the engine with the exception of the valve retainers. Only magnetic steel valves and valve springs are permitted.

I. Cylinder heads must be I-10 SPEEDWAY approved and all modifications must be submitted to I-10 SPEEDWAY before any proposed modifications will be eligible for approval. All manufacturers' identification and part numbers must remain on the part being used in competition.

1. All cylinder heads must be of cast iron construction and produced by the OEM manufacturer in quantities readily available. Camel back and Vortec heads are permitted. Bow Tie heads are permitted. Cars with Bow Tie heads must add 50 lbs. plus the loss of 1% left-side weight. All cylinder heads for use on Ford or Chrysler engines must meet with prior tech approval before they will be considered legal for use in competition.

2. ASA, Irwindale, Mesa Marin and Chevy Crate Motors can run aluminum heads.

3. A maximum of three (3) angle valve job will be permitted. When cutting the valve seat angles, stone or grinding marks will not be permitted above the bottom of the valve guide. All cutting in reference to the valve job and bowl area must be centered off the centerline of the valve guide. Radius cuts will not be permitted. Upon completion of the valve job, the bowl area above the valve seat to the bottom of the valve guide must still be the same configuration as far as shape and finish as it was from the manufacturer. Surfaces and/or edges where the cutter or stone has touched must not be polished. Hand grinding or polishing will not be permitted on any part of the head.

4. Resurfacing or milling on the gasket surface only is allowed.

5. Port matching of the head a maximum of 1/4 inch into the intake port is permitted.

6. No other modifications are allowed. No porting (other than listed above), polishing, or removal of material from any surface of the cylinder head by any means mechanical, chemical or any other way not listed.

I. All valves must be identical in appearance and constructed as an OEM type valve. Undercut valve stems or radiused (tuliped) valve heads are not permitted. The maximum valve sizes, as measured across the face of the valve, are as follows:

Intake – 2.050

Exhaust – 1.625

The valve stem centerlines must remain in the OEM location and dimension for the heads being used.

J. Camshaft must be a solid steel lifter type. Hydraulic or flat-tappet lifters are permitted and must maintain original manufacturer's stock diameter. Mushroom, roller or roller type lifters are prohibited. Camshaft must be designed so that each lifter maintains contact with each lobe at all times.

K. Independent stud, roller-tip rocker arms, and stud girdles are permitted. Shaft rockers are not permitted.

L. Only standard magnetic steel or cast iron production design crankshafts will be permitted. If aftermarket crankshafts are used, they must be designed and manufactured the same as an OEM crankshaft for the approved standard production engine. Crankshaft must weigh a minimum of fifty (50) pounds and cannot be altered in any manner such as knife edging. Stroke must not be increased or decreased. Balancing will be permitted.

M. Connecting rods must be solid, magnetic steel. Aluminum, titanium, stainless steel or hollow rods are not permitted.

N. Aluminum or steel one-piece intake manifolds are permitted. The intake must remain stock as sold by original manufacturer. The intake may be port matched a maximum of 1/2 inch into the intake ports of the head.

O. A maximum one (1) inch thick adapter may be used between the carburetor and the intake manifold. Adapter may not be altered to accommodate carburetor and/or intake manifold.

P. A single Holley 4412 (casting number 3250), 2 barrel carburetor must be used. The ONLY approved modifications are as follows:

1. The choke airhorn may be removed with a square mill cut.

2. The butterflies may be drilled with one (1) idle hole each, maximum of 3/16 inches diameter.

3. Cam and accelerator pump may be replaced with aftermarket.

4. The choke and linkage may be removed, but screw holes must be filled.

Q. Engine must use a wet sump oiling system. Dry sump are not recommended due to severe weight penalties. An accusump type auxiliary oil reservoir is permitted. Any car with a dry sump system is subject to a weight penalty based on other weight penalties the car has already received at the discretion of I-10 Speedway.

R. On ALL cars the oil pan must have an inspection plug with a minimum diameter of one (1) inch on the driver's side allowing visibility of the crankshaft and connecting rods.


A. Engine must be located so that the forward most spark plug hole is within two (2) inches of a line connecting the rear of the upper ball joints.

B. Crankshaft must be centered within one (1) inch of the vehicle's front treadwidth.

C. All mounts must be securely bolted and adjustable mounts are not permitted.

D. Minimum clearance between the center of the crankshaft and the ground must be ten (10) inches.


A. All cars must have a functional fan containing a minimum of four (4) blades, and a minimum diameter of fourteen (14) inches. Free spin or clutch fans are not permitted.

B. All cars must have a fan guard in place. Fan shrouds or ducts directing air to the radiator are permitted between the frame rails.

C. Electrical fans are permitted, but must be mounted on the back side of the radiator only.

D. Radiators must be stock appearing and remain in the stock location.

E. Anti-freeze is not permitted for use in the cooling system.

F. A minimum one (1) gallon overflow catch tank is required in all cars. Catch tank may be located in the engine compartment with a hose protruding enabling the driver to see overflow.

G. Water pump must be mechanically driven, must be located in the stock location and must rotate in the same direction as the crankshaft. All coolant must flow in the same direction as the OEM production engine.


A. Any exhaust manifold may be used.

B. Exhaust pipes from the header to the collector may not be larger than five (5) inches in diameter (O.D.).

C. 95 DBA at 100 feet.


A. Any OEM or aftermarket manual transmission may be used. Transmissions with enclosed clutches are not permitted.

B. Minimum diameter of clutch plates and discs must be five and one-half (5-1/2) inches. The pressure plates and discs must be made of magnetic steel only.

C. Aftermarket scatter shields are recommended.

D. Flywheel must be constructed of aluminum or steel.

E. Driveshafts must be constructed of magnetic steel and painted white.

F. All cars must have a minimum of two (2) driveshaft safety loops constructed of no less than 1/8 inch by one (1) inch steel straps.

G. Quick-change rear ends are permitted. Aftermarket floater rear ends are recommended. Cambered rear ends are not permitted.


A. Only four (4) wheel disc brakes with magnetic steel, non-coated rotors are permitted. Drum type rear brakes are permitted.

B. Brake bias valves are permitted. Aftermarket, racing brake master cylinder assemblies are permitted.

C. Aftermarket calipers are permitted.

D. Brakes must be functional at each wheel during competition.

11. TIRES AND WHEELS (Must start main on the tires you qualify on)

A. Fifteen (15) inch magnetic steel wheels with a maximum width of eight (8) inches are required. Wide five (5) pattern wheels are permitted, but must add 25 lbs.

B. Minimum wheel offset allowed is three (3) inches. Maximum wheel offset allowed is five and one-half (5 1/2) inches.

C. Air bleeders are not permitted.

D. Use of the I-10 SPEEDWAY track specified tire is mandatory (Hoosier [R] 2070 [L] 2040). Soaking, softening or otherwise altering the composition of tires is not permitted. 12. ELECTRICAL SYSTEM

A. Electronic distributors, single or dual point distributors, or any camshaft driven type distributors are permitted. Magnetos, crank trigger, optically triggered or computerized systems are not permitted.

B. All cars must be equipped with a functioning starter located near the stock location.

C. All cars must be equipped with a master electrical switch located in the cockpit of the car. The switch must be within reach of the driver and safety crew from the left side of the car.

D. Batteries must be securely mounted within the confines of the body.

E. Batteries must be contained in leak proof, electrically insulated containers. Dry cell batteries are not required to be contained in a leak proof container.


A. Fuel may not be cooled by any means prior to entering the carburetor.

B. All cars must be equipped with an I-10 SPEEDWAY approved fuel cell. Fuel cells must be securely mounted in the trunk area as far forward as possible.

C. Fuel cells must be mounted within a steel framework constructed of steel square tubing (1 inch x 1 inch, 0.065 inch minimum).

D. The framework must attach to the frame rails with a minimum of four (4) one-half (1/2) inch bolts. Framework may be welded to the main frame rails of the car.

E. Glass fuel filters, electric fuel pumps, and belt driven fuel pumps are not permitted. Fuel line may not enter the driver's compartment.

14. FUEL

A. The only fuels permitted for use is Torco, 110 octane.

B. The chemical composition of the fuel may not be altered by any means.


A. Full tube frames or stock subframes are permitted.

B. Unibodied cars may connect the front and rear subframes.

C. Main frame rails must be OEM or constructed of a minimum two (2) inch by two (2) inch rectangular tubing having a minimum thickness of 0.120 inches.

D. Clearly marked tow hooks must be located in both the front and rear of the car for use by the safety crew.

E. Roll cages must be constructed of steel with a minimum outside diameter of one and three-quarters (1 3/4) inches and a minimum wall thickness of 0.095 inches.

F. The left side door area must have at least three (3) complete horizontal bars between the pillars and two (2) vertical bars extending from the windshield opening to the frame.

G. The right side door area must have at least two (2) horizontal door bars between the pillars and two (2) vertical bars extending from the windshield opening to the frame.

H. The roll cage must be attached to the chassis in a minimum of six (6) locations. The roll cage must be welded to the chassis and cannot be bolted.

I. Any areas of the roll cage that may in any way come in contact with driver must be padded using dense foam padding specifically manufactured for use as racing roll bar padding. The use of pipe insulation wrapping is not permitted.


A. For all safety equipment. It will be the sole responsibility of the driver, not I-10 SPEEDWAY, their agents/officials or corporate officers to ensure that his/her safety equipment is correctly installed, maintained, and properly used. Please refer to manufacturer installation an usage guide lines and adhere to them.

B. Aluminum professionally built high back racing seat required. No plastic, etc.

C. Padded headrest required.

D. Seat must be securely bolted to a mount assembly, that is an integral part of the roll cage.

E. Seat will not be attached to the floorboard.

F. A five- (5) point safety harness, with quick release is mandatory! 3" wide lap belt, 2" or 3" shoulder belts, and a 2" submarine belt. All belts shall be attached to roll cage using minimum 3/8 grade 8 hardware and safety cables.

G. Cotton harness components prohibited.

H. Safety harnesses/seat belts may be no more than three (3) years old. If necessary, proof of purchase may be required.

I. Safety helmet must meet Snell 95 testing standards, bear proper identification, and have no signs of previous damage.

J. Window net mandatory! Minimum 1" mesh with release at top only. It is required that all window net releases be updated to the quick release seat belt type with releases located and facing the outside of the car. No close mesh off-road type allowed.

K. Fire suit mandatory at all times.

L. Approved racing gloves mandatory. No welding gloves, gardening gloves, etc.

M. Approved racing shoes recommended. No nylon shoes permitted.

N. Eye protection is mandatory and must be in proper place at all times.

O. Current test date (2 pound minimum) fire extinguisher to be installed in the car within drivers reach while strapped in. Steel mounts only, no plastic.

P. Two (2) drive line straps, 1" x 1/8" required Mounting to be within 6" of the U-Joints.

Q. All cars will be required to have in their pits a minimum of one 5 pound, Halon or dry chemical fire extinguisher. This is to be visible to tech officials and all crewmembers. All crew members must be made aware of its location, and knowledgeable in the use of the fire extinguisher.

R. Car and driver will be required to make safety rule violations comply PRIOR to racing any event. 17. WINDOWS

A. A windshield made of clear safety glass or lexan must be used. Minimum thickness is 1/8 inch. Windshields must be supported between the dash bar and roof halo bar with a minimum of three (3) evenly spaced metal straps 1/8 inch by 1 inch or a single 1.75 inch bar in the center of the windshield welded to the dash bar and the roof halo bar.

B. Each car may have a rear window made of clear lexan. Rear windows must be flat and not dished from roof to deck lid.

C. All side window glass must be removed. A right side window of any type is not permitted. Side quarter windows behind the "B" pillar can be replaced with lexan. Driver side window net is required on all cars. Net material must be minimum 3/4 inch wide and have openings of at least one (1) inch. Net must be equipped with a quick-release device on the top left front corner.


A. All cars must have a clearly visible number on both sides and on the roof (right side reading).

B. Side numbers must be a minimum of eighteen (18) inches tall. Roof numbers must be a minimum of twenty-four (24) inches tall.

C. Numbers must be of a contrasting color to the area of the car on which they are displayed.

D. Two (2) digit numbers are recommended, however, three (3) digit numbers are permitted.

E. Car owners must register choice of car number with I-10 SPEEDWAY prior to the start of the season.


A. The use of a two-way radio for communication with a spotter and/or pit crew member is recommended.


A. No transmitting or listening devices.

B. No electronic monitoring computer devices capable of storing or transmitting information except tachometers.

C. No digital gauges, timing retard controls or oxygen sensors allowed.

D. No electronic traction control devices allowed.


°F | °C
Humidity: 38%
67 | 94
19 | 34
Mostly Sunny
68 | 95
20 | 35

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