4-1.1 Limited Sportsman Division Races

Oxford Limited Sportsman races are open to eligible 1962 to 1987 models of Ameri-can made production car passenger cars. No station wagons or convertibles allowed.

4-1.2 Approved Competition Models

The following cars are the eligible models approved for competition:

Chevrolet - Camaro, Nova, Malibu, Monte Carlo

Pontiac - Firebird, Ventura, LeMans, Grand Prix

Oldsmobile - Omega, Cutlass

Buick - Regal

Ford - Mustang, Maverick, Thunderbird

Mercury - Cougar

Dodge - Dart, Aspen

Plymouth - Volare, Scamp, Valiant

Bodies may be up to 2000 and must be factory steel OEM bodies. New style Camaro bodies must run full rear Lexan type window. All other models must be approved by Oxford Plains Speedway.

4-2.1 Car Bodies

(a) Car bodies must be neat appearing. Panels must remain as manufactured, except for roll bar, tire and wheel installation. The ARP 1997 style Camaro body will be permitted as manufactured by ARP with either a Steel or Fiberglass roof, and must be mounted to ARP measurements. Older style Steel Bodies manufactured by ARP or Five-Star allowed. Examples would include Chevrolet Lumina, 1995 or older Pontiac Grand Prix, Oldsmobile Cutlass and Buick Regal. No newer year model aftermarket bodies permitted.

(b) Original dimensions of all bodies must remain as manufactured.

(c) All cars must have complete bodies, stock to all measurements. Aftermarket rubber nose and tail light sections may be used but must be same year on front and rear. Four inch minimum ground clearance.

(d) Full windshield must be used. Must be Lexan material. Lexan type rear window may be used. Cars with rear quarter panel windows may be filled with Lexan type material. No tinted windows permitted.

4-2.2 Weight

Weight may be added, but may not be added inside the drivers compartment. All cars must weigh a minimum of 2,850 pounds and maximum 54% left side weight with driver, gas, oil, water, and be race ready. Cars using crate motor Part #88958602 as purchased from GM may have minimum weight of 2,800 lbs and 56% left side weight. 

4-3.1 Seat

Driver’s seat must be specifically designed for auto racing and constructed of .125 inch thick aluminum. No fiberglass seats permitted. Aircraft-quality hardware is required for attaching seat to seat sub-structure as described in diagram section.

4-3.1.1 Seat Location

Seat must be installed in the stock location.

4-3.2 Front Fire Wall

Stock front fire wall must be maintained and in the original position. All holes must be covered. No aluminum permitted.

4-3.3 Rear Fire Wall

Fire wall must be steel and seal off the trunk area from the inside of the car.

4-3.4 Hood and Trunk Lids

Hood and trunk lids must have inner reinforcements removed. No non-factory hood scoops permitted. Must have positive pull-pin type fasteners.

4-3.5 Inner Panels

Inner panels may be removed, but the front half of the rear fender well must remain attached to the rear fire wall in the stock location. Wheel opening may be trimmed up to 2 (two) inches from the tire size for clearance. All wheel opening edges must be finished to eliminate sharp edges.

4-3.6 Bumpers

Front and rear bumpers must be mounted in stock location. No crash guards permitted on either front or rear bumper.

4-3.7 Spoiler / Air Dam

(a) Front spoiler / Air dam minimum ground clearance shall be four inches. Front spoiler/Air dam must be located behind the front bumper.

(b) Rear spoiler shall not exceed 5 (five) inches in overall height and shall not exceed 60 inches in width. Spoiler must be mounted at rear of trunk lid. Spoiler must be fastened at the rear of the spoiler only. No side bracing or boxing permitted. Maximum height of spoiler from ground to top of spoiler to be 39.5 inches.

Any bodies that do not meet Technical Inspectors approval may be assessed a weight penalty. The penalty will be a minimum of 50 lbs. right side weight.

4-3.8 Dashboard

A fabricated dashboard must be located in the stock location. Original dash may be used, but must have combustible components removed.

Only Oxford Plains Speedway approved engines permitted. Engines may be changed within any corporate manufacturer’s product line. But must match chassis make. Absolute maximum engine compression shall be 11.0 to 1.

The factory sealed stock circle track engine P/N #88958602-GMR-350/355 may be used as shipped with all seals in place. No alterations permitted.

4-4.1 Eligible Models

Only stock engine that was available as a regular dealer option for year and model car shall be only engines permitted. Like engines of different year may be used if ALL measurements are alike and all bolt-on equipment fits that engine. Carburetor, intake manifold, and exhaust manifold must be stock for year and model used. No aluminum blocks permitted. Absolute maximum engine compression shall be 11:0

4-5.1 Engine Location

Engine location is to be 1 inch setback maximum. Cross member not to be cut or tampered with in any way shape or form, Motor mounts may be stock or aftermarket.

4-5.1a Crankshaft Height

Crank height is to be a minimum of 12 inches from the ground. Measured from the ground plane to the center of the crankshaft.

4-5.2 Exhaust Manifold

Minimal performance headers, ie Blackjack type permitted. No Brezezinski-type exhaust manifolds permitted. Exhaust pipe not to exceed 2 ½ inches inside diameter.

4-5.3 Engine block

Stock for make and model

4-5.3.1 Engine Overbore

Maximum .040 overbore permitted.

4-5.3.2 Crankshaft

Crankshaft must be O.E.M. steel or cast iron. No lightening or knife edging permitted. Balancing permitted.

4-5.4 Pistons / Rods

No pop-up pistons permitted. Any flat-top two valve relief pistons allowed. Aftermarket steel connecting rods allowed. No aluminum, titanium, or carbon fiber, etc. type material connecting rods permitted. Stock length rods required. i.e. GM engines would use the 5.7 inch rod

4-5.5 Oil Pan

Aftermarket oil pan allowed.

4-5.5a Harmonic Balancer

Stock damper only.

4-5.6 Cylinder Heads

Stock for engine used. GM Vortec heads as manufactured by General Motors permitted. Screw-in studs permitted.

4-5.6.1 Valves

Stock for engine used.

4-5.7 Camshaft / Valve Lifters / Rocker Arms

4-5.7.1 Camshaft

Stock for engine used. Maximum gross valve lift is .450, measured at the valve.

4-5.7.2 Valve Lifters

Stock for engine used. No roller lifters permitted.

4-5.7.3 Rocker Arms

Stock ratio rocker only. No roller rocker arms permitted

4-5.8 Intake Manifold

Stock 2 barrel cast iron intake manifold for engine used. No modifications permitted. Edelbrock aluminum #2101 (GM) or #2181 (Ford) permitted. No Brezezinski intake manifolds permitted. GM Intake #14057059 and #14057060 not permitted.

4-5.9 Carburetor

Stock 2 barrel for engine used. Holley 4412 carburetor with adapter plate not to exceed 1 (one) inch permitted when Edelbrock #2101 or #2181 intake is used. No 600 cfm carburetors permitted. No K+ N air filters permitted.

4-6.1 Ignition System

Stock ignition system must be used.

4-6.2 Starter

Stock starter in stock location must be in working order.

4-6.3 Battery

All batteries must be securely fastened and covered. Battery may not be mounted in the trunk area.

4-6.4 Alternator / Generator

Use of an alternator or generator is optional.

4-6.5 Electrical Safety Switch

Car shall be equipped with a safety switch that will effectively kill the power from the battery to the car’s ignition system. Switch must be mounted within reach of the driver’s side window opening.

Any stock appearing radiator permitted. Must be in standard location and inside body work. Must have a minimum 1 (one) quart overflow tank located in engine compartment. No antifreeze may be used, but a cooling additative is permitted.

Exhaust pipes must extend beyond the driver.

4-9.1 Flywheel

Stock flywheel. GM may use stock Corvette Flywheel, minimum weight shall be 17 pounds. No alterations permitted. No aluminum flywheels permitted.

4-9.2 Transmission

Stock AUTOMATIC transmission must use stock converter for year and model used. All gears must be working. Stock cast iron three-speed transmission with hydraulic clutch linkage, aluminum bell housing with a steel plate welded in place as a scatter shield and stock flywheel and pressure plate may be used.

4-9.3 Drive Shaft

Only steel drive shafts permitted. It is mandatory that two 360 degree brackets, no less then 2 (two) inches wide by 1/8 inch thick be placed around the drive shaft and fastened to the floor or cross member to keep the shaft from becoming dislodged and dropping out. All drive shafts must be painted white.

4-9.4 Rear End

Any factory type OEM rear end may be used. Manufacturer’s line must be followed. Mini spool rear end permitted.

4-9.5 Wheels

Maximum width on all wheels is 8 (eight) inches. All wheels must be steel. Stud size is optional.

4-9.6 Tires

6-10.1 Frames

Stock frame must be maintained. The frame construction, center line of the rear end to the rear bumper, may be fabricated. No tubing may pass beneath the rear end housing. Bumpers must remain in stock location.

4-10.2 Upper Control Arm Mounts

Relocation of upper control arm mounts allowed.

4-10.3 Rear Clip

No third or fourth generation Camaro/Firebird suspension permitted.

4-11.1 Springs

Stock of aftermarket steel springs may be used. Coil springs must maintain a minimum diameter of 5 (five) inches. Rear leaf springs must be of stock configuration. Lowering blocks or spacers may be used and front adjustable spacers are permitted. All springs must utilize original hangers or pockets and adjustable shackles are permitted on leaf spring cars. No slider type hanger assemblies permitted Spring pockets may be re-inforced, but must remain in stock position. A 3 inch by 5 inch hole is permitted for spring adjustment access.

4-11.1 (a) Coil spring cars are permitted to run 3 point hitch and pannard bar. Solid bar only. Aftermarket trailing arms permitted. No jacking bolts allowed. Rear spring buckets may be cut out and replaced.

4-11.1 (b) Rear frame rails must be of stock configuration. Rear shackles must be: One on left side of the frame rail and one on right side of the frame rail on both sides, equalling 4 shackles. The measurement from the center of the shackle bolt to the plane of the rear frame is to be 12 inches. Front of the rear spring pockets must remain stock in stock location using original spring hangers.

4-11.2 Sway Bars

Sway bar must mount in original location on lower control arms and frame. Must match manufacturer’s line.

4-11.3 Shock Absorbers

Original type equipment shock required. Shock must be in original position with only one shock per wheel.

4-11.4 A-Frames

(a) Upper control arms may be solid tubular non-adjustable steel.

(b) Lower control arms must remain a stock unaltered OEM part.

(c) No adjustable type ball joints permitted

4-11.5 Spindles / Hub

Must be stock for make and model used. Coil spring cars may run aftermarket spindles.

4-11.6 Wheel Base

Minimum allowable wheel base is 108 inches. Must be stock for make and model used. Ford cars with 103 inch wheel base and 2 door Maverick body may be used. (Maximum engine is 302 cubic inches in this car). 104.5 inch Thunderbird permitted.

4-11.7 Tread Width

All cars must not exceed a maximum allowable tread width, front and rear, of 65 inches, measured at the center line of the wheel, zero toe-in, at spindle height.

4-11.8 Body Mounting

Body must be mounted as built by the factory.

4-11.9 Height Measurements

All measurements will be taken with driver in the car.

Minimum roof height is 48 inches measured 10 (ten) inches back from windshield in center of roof.

Minimum crankshaft height shall be 12 inches measured from center of crankshaft to ground plane. A 3 (three) inch clearance of oil pan is required or a skid plate is mandatory.

A 4 (four) inch ride height/ground chassis clearance is required and will be measured from the lowest part of frame rail.

Cars with uni-body construction will be measured 4 inches from the lowest part of the frame.

Four wheel brakes in good working order are mandatory.

Only Oxford Plains Speedway approved fuel may be used.

4-13.1 Fuel Cell

Approved fuel cell with all components with a maximum capacity of 22 gallons, U.S. Measurement, is required. Must be enclosed in a 20 gauge metal canister and installed in an approved manner.

No fuel cell will be offset more than 1 (one) inch from the center line of the car, (center of cell to center line of car). Refer to diagram section for recommendations for proper installation. A check valve must be installed on the vent line. It is recommended that a fuel line shut off valve be installed in the trunk area. A safety loop designed to protect the rear of the fuel cell is recommended. Minimum ground clearance from the bottom of the fuel cell to the ground plane is 8 (eight) inches.

4-13.2 Fuel Pump

Stock fuel pump only. No electric fuel pumps permitted.

4-14.1 Roll Bars

All cars shall be required to have a four-point rollcage structure of minimum 1 ¾ inch outside diameter, DOM or seamless .090 inch wall thickness molyendum or mild steel tubing. The rollcage structure shall be fully triangulated with minimum 1/8 inch gusset plates utilized at all major tube intersections. The four point rollcage structure shall have a minimum of 4 (four) horizontal driver’s side "door" bars, and at minimum a "X" structure spanning the opposite side door area between the front and rear rollcage uprights.

Rollcage structure shall be integrated to front frame stub via a "hoop" section surrounding the engine compartment and joining the front rollcage uprights. Rear braces shall extend diagonally from top rear horizontal rollcage members to "kickup" sections of rear frame member. Bottom bay of rollcage structure shall have an X-structure spanning between the frame rails. Rear frame section shall have an "X" or oblique members to stiffen frame rails against rear corner impact, lessening parallelogram rollcage tendency of rear rails. A sub-structure integral with the frame and rollcage members shall provide driver seat mounting points. Foot well area of driver’s compartment must have oblique horizontal member connecting forward upright and main frame rails, then bracketed to engine compartment main hoop.

The 4 (four) point cage shall be symmetrical in all directions. Minimum length of door bars is 42 inches. Top hoop and uprights must closely conform to the roof line and windshield post max 1-1/2" space between body and cage components. Width of halo to be no less than 46 inches outside to outside of tubing. Full dashbar required. All cars must have an X-type member across and behind driver. One piece tubing run diagonally or perpendicular between halo in top of cage required. Minimum height of door bars on driver’s side is 22 ½ inches from bottom of frame. Passenger side door bars may be the X’d structure spanning passenger door area. A so called "Petty Bar" must run from center of cage to upper right front halo.

All major rollcage members including uprights, connectors, "door" bars, on left or right side, and major braces must be a minimum of 1 ¾ inch, .090 inch thickness tubing as specified above.

Incidental structure components for bracket, component mounting, etc., may be fabricated of lighter material. Full circumference, high quality welds are mandatory on all tube connections.

Roll cage material is subject to sonic testing or inspection hole testing for compliance with these rules. A tester for analysis of frame/cage strength may be used repeatedly. Driver’s door must have plate covering it with minimum of 16 gauge metal between door bars and body on driver’s side only. Minimum 40 inches in length and 17 inches high. 16 gauge metal may be welded in between door bars and door bar connectors on driver’s side only.

4-14.2 Additional Roll Cage Specifications for all Cars

Roll cage members must CLOSELY conform to window/roof/door contour and not be readily apparent when car is viewed from side area. Rollcage members must be within tube diameter dimensions of actual roof components.

4-14.3 Fire Extinguisher

A working fire extinguisher must be within the reach of the driver and must be mounted on the right side of the car.

4-14.4 Part Identification Numbers

Any parts that have any identification numbers and those numbers are removed or altered will be declared non-conforming.

4-14.5 Non-Conforming Parts Penalty

Any parts that are found to non conforming to the rules contained herein will become the property of Oxford Plains Speedway and must be surrendered immediately upon demand. Parts will be held by Oxford Plains Speedway and will be disposed of at the desire of Oxford Plains Speedway. If any team refuses to turn over any requested part or parts then that team will be denied access to Oxford Plains Speedway until such parts have been surrendered to the satisfaction of Oxford Plains Speedway management. An additional fine may be imposed as part of the penalty.

4-14.6 Declaration of Intent

Anything not specifically covered in this rule book must be approved for competition by the Technical Director.

4-14.7 Eligibility

A competitor who competes in 5 (five) or less features in a given division in a given year will be eligible for future rookie status.

IT IS THE RESPONSIBILITY OF THE COMPETITOR TO OBTAIN AND BECOME FAMILIAR WITH THE CURRENT RULES PERTAINING TO THE DIVISION IN WHICH HE/SHE CHOOSES TO PARTICIPATE.