OXFORD PLAINS SPEEDWAY
Route 26, Oxford, ME 
Phone: (207) 539-8865 

2008 RULE BOOK

STRICTLY STOCK

*NOTICE*

NO EQUIPMENT WILL BE CONSIDERED AS HAVING BEEN APPROVED BY REASON OF HAVING PASSED THROUGH INSPECTION UNOBSERVED. THE TECHNICAL DIRECTOR SHALL DETERMINE AS TO WHETHER ANY TYPE OF CONSTRUCTION, DESIGN, OR INTERPRETATION OF ANY RULE SHALL BE ACCEPTED.

OXFORD PLAINS SPEEDWAY RESERVES THE RIGHT TO UP-DATE, MODIFY, ADD, OR DELETE RULES AT ANY TIME IN THE INTEREST OF PROVIDING PARITY FOR ALL COMPETITORS. ADDITIONAL REQUIREMENTS MAY BE MADE VIA OFFICIAL ENTRY REGISTRATION, TECHNICAL BULLETIN, OR MEETING ANNOUNCEMENT, WHICH AU TOM ATICALLY AMENDS SPECIFICATIONS HEREIN.

5-1 COMPETING MODELS AS SELECTED BY OPS

5-1.1 Strictly Stock Races

Oxford Strictly Stock races are open to eligible 1960 and newer models of American made passenger car production cars. No station wagons, convertibles, 4-Wheel drives, Camaro, Firebird, Mustang, or Cougar models permitted.

5-1.1 (a) Strictly Stocks may use two-way radios. All frequencies must be registered with the Technical Director.

5-1.2 Approved Competition Models

The following are eligible models approved for competition: 4-door sedan, 4-door hardtop, 2-door sedan, 2-door hatchback, 2-door hardtop and 2-door coupe. The Five-Star early 80‘s style aftermarket sheet metal may be used on metric frame GM style cars.

5-2 GENE RAL CAR BODY REQUIREMENTS

5-2.1 Car Bodies

(a) Cars should be neat appearing. Panels must remain as manufactured and must match stock frame for body used. All chassis must maintain stock wheelbase.  108” metric chassis may run 1988 and up factory steel front wheel drive bodies.  Example:  Pontiac Grand Prix.  Big chassis cars must run chassis with matching wheel base.

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

(c) All cars must have complete bodies, stock to all measurements.

(d) Doors must be welded shut.

(e) Full windshield must be used. Lexan type replacement may be used. All other glass must be removed. Lexan type rear window may be used. No tinted windows permitted.

(f) All GM cars may use either a stock OEM type header for make and model or an early 80’s type Monte Carl o nose section. Ford cars may use either a stock OEM type header or an early 80’s type Thunderbird nose.  Aftermarket nose and tail sections must be approved by tech director.

5-2.2 Weight

No ballast weight may be added.

5-3 DETAILED BODY REQUIREMENTS

5-3.1 Seat

Driver’s seat must be specifically designed for auto racing and be constructed of .125 inch thick aluminum. NO fiberglass seats permitted.

5-3.1.1 Seat Location

Aircraft quality hardware must be used to install the seat in an approved manner and be in the stock location. Mounting plate may not excede the dimensions of the seat bottom and must be a maximum of 3/16 inches thick.

5-3.2 Front Fire Wall

Stock fire wall must be in original position. All holes must be covered. No aluminum permitted.

5-3.3 Rear Fire Wall

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

5-3.4 Hood and Trunk Lids

Full hood and trunk lids required. Inner reinforcements must be removed. Must use positive pull-pin type fasteners.

5-3.5 Inner Panels

Inner panels may be removed, Wheel openings 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. Full dash required. Combustible material and plastic must be removed. Stock dash frame work may be covered with aluminum. Fabricated dash may be used, but must follow the full contour of the windshield between the "A" posts. Vertical panel must extend between the "A" posts. Instruments must be neatly mounted on the vertical panel of the dash. Fabricated dash dimensions must match that of the original stock dash.  Rub rails may be used maximum 1” square tubing must be flat against body.  Subject to appro val of tech inspector.

5-3.6 Bumpers

Stock front and rear bumpers may be used. Approved tube type front and rear bumpers may be used and must be covered with an approved bumper cover. The early 80‘s style Monte Carl o and Thunderbird are the only approved bumper covers.

5-3.7 Body Mounting

Body must be mounted in stock location using stock body mounts and all stock body rubbers must be used. Tech director will determine if body has been mounted within acceptable tolerances.  A posts must remain attached to roof in stock location.

5-3.10 Crankshaft Height

15 inches minimum, measured from center of harmonic balancer to ground. 

5-3.11 Frame Height

Minimum 6 inches with driver in car.

5-4 GENE RAL ENGINE REQUIREMENTS

Engines must be stock within any corporate manufacturer’s line and be identical for make and model line.

5-4.1 Eligible Engines

Only a stock engine that was available as a regular dealer option for year and model of car used shall be 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 make and model used. No aluminum blocks permitted.

5-5 DETAILED ENGINE REQUIREMENTS

5-5.1 Engine Location

Stock location using stock motor mounts.

5-5.1a Crankshaft

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

5-5.2 Engine Block

Stock for make and model year. No machine work permitted. .040 overbore permitted.

5-5.3 Piston / Rods

Any stock flat top with four val ve relief piston. No aftermarket performance pistons permitted. No aftermarket alloy rods permitted. No special performance parts permitted. Stock rods only.

5-5.4 Oil Pan

Stock for engine used. No external oil coolers permitted.

5-5.5 Cylinder Heads

All cylinder heads must be untouched. No porting or polishing permitted. Minimal plaining to square a head may be permitted. All cylinder heads must be cast iron, original equipment manufacture production. The only exceptions to this are noted below with a (++) symbol. Specifications as follows:

General Motors maximum intake diameter 1.94", maximum exhaust diameter 1.50".

Chrysler 340 ci motors maximum intake diameter 2.02", maximum exhaust diameter 1.60".

Chrysler 360 ci motors maximum intake diameter 1.88", maximum exhaust diameter 1.60".

Ford Cleveland motors maximum intake diameter 2.19", maximum exhaust diameter 1.71"

Ford Windsor motors maximum intake diameter 1.84", maximum exhaust 1.54"

All General Motors heads must use 1.250" diameter val ve springs. Any cylinder head not listed must be approved by the management of Oxford Plains Speedway before being used.

5-5.6 Valves

Stock val ve dimensions and springs for casting used. No machine work permitted.

5-5.7 Camshaft / Valve Lifters / Rocker Arms

5-5.7.1 Camshaft

Stock for engine used with maximum gross val ve lift of .450, measured at the val ve.

5-5.7.2 Valve Lifters

Stock for engine used. Hydraulic lifters only. No roller lifters permitted.

5-5.7.3 Rocker Arms

Stock ratio only. No roller rockers permitted.

5-5.8 Intake Manifold

Stock 2 barrel intake manifold for engine used. No aluminum intake manifolds permitted. GM intake manifold #14057059 and #14057060 are not permitted. No Brezezinski intake manifolds permitted

5-5.9 Carburetor

Stock 2 barrel carburetor required. NO 500 CFM or 600 CFM carburetors permitted. No K+N air filters. No spacers permitted.  Maximum 1 gasket permitted.

5-6 ENGINE / CAR ELECTRICAL SYSTEM

5-6.1 Ignition System

Stock ignition system must be used.

5-6.2 Starter

Stock starter must be in proper working order

5-6.3 Battery

Must be securely mounted in a steel box with a steel cover. Steel box shall be welded to the roll cage and mounted on the right side of the car on the back side of the roll cage rear upright bars. 

5-6.4 Alternator / Generator

Use of alternator or generator is optional.

5-7 ENGINE COOLING SYSTEM

Stock radiator required. Aluminum radiator permitted. Must be in stock location and inside body work. No anti-freeze permitted. Water only. Cooling additive may be added. A 1 (one) quart overflow tank located in the engine compartment is required. Independent brackets may be used to mount the radiator.

5-8 ENGINE EXHAUST SYSTEM

5-8.1 Exhaust Manifold

Must use stock exhaust manifold. No headers permitted. Mufflers may be removed. No center dump (ram horn) exhaust manifolds allowed

5-8.2 Exhaust Outlet

Exhaust outlet not to exceed 2 ½ inches in diameter. Exhaust pipes must go beyond the driver.

5-9 DRIVE TRAIN

5-9.1 Flywheel

Stock flywheel required. No alterations permitted.

5-9.2 Transmission

Must be stock AU TOM ATIC TRANSMISSION. All gears must be in proper working order. Stock converter required. External transmission coolers permitted, but must remain in the engine compartment. Three speed automatics only. No 2 speed power glide transmissions permitted.

5-9.3 Drive Shaft

Only steel drive shafts permitted. It is recommended that 2 (two) 360 degree brackets, no less than 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 drive shaft from becoming dislodged and dropping out. All drive shafts must be painted white.

5-9.4 Rear Ends

Only stock rear ends for year and model car used permitted. Gear ratio shall remain stock and rear ends must not be altered in any way. No posi-traction type rear ends permitted. Maximum gear ratio of 3.73

5-9.5 Wheels

Stock or White-Spoke steel wheels with a maximum width of 7 (seven) inches required. Either 15 or 16 inch wheels may be used, but must be same size on both sides. Wheel nut size is optional.  Right side wheel nuts must be one hex wheel nuts. All wheels must be same size. White spoke and 16" wheels must have an offset of maximum 4 (four) inches when measured from the front side of the wheel and the offset must be the same on ALL four wheels..

5-9.6 Tires

Standard passenger car radial tires only. 70 or 75 series tires only for 15 inch series. Maximum size is 235. Tres may be interchanged in size from left to right by one tire size. 60 or 65 series tires only for 16 inch series. No mixing of 60 or 65 series. Refer to Rule 1-38 for the Oxford Plains Speedway tire policy.  NO RETREADED TIRES ALLOWED.

5-10 SUSPENSION

5-10.1 Springs

All springs must be stock type springs. Front springs must have the same wire size side to side. Front torsion bars must have identical size on both sides. Rear coil springs and leaf springs must have same wire size and outside diameter. Minimum outside diameter is 5 (five) inches. No spring boosters permitted. All springs side to side must have same wire size. No springs may go through top of frame.  Adjustable spring pockets may be used on top of front springs.  No holes may be cut in frame.

5-10.1 Sway Bar

Must be stock sway bar and mounted with all rubbers and washer, but may be adjusted on either end.

5-10.2 Shock Absorbers

Original equipment gas shocks only. Shocks must be in original position.

5-10.3 Front End Suspension Components

All front suspension components must be stock for make and model used. Left A frame to be used on left side only, right A frame to be used on right side only.

5-10.4 Caster / Camber

Must be within the limits set by the Technical Director before the car is permitted to race. Adjustment limited to factory tolerances. Maximum top to bottom camber difference is 2 (two) inches. Left front may have a maximum ½ inch negative camber.

5-10.5 Wheel Base

Minimum allowable wheel base is 108 inches. Ford Fairmont models with 105.5 inch wheel base may be used. Ford Thunderbird with 104.5 inch wheel base may be used. Must be stock for chassis used.

5-10-6. Tread Width

Must be stock for the make and model used. 

5-10.7 Ground Clearance

All measurements will be taken with driver in the car.

Minimum ground clearance measured from the lowest part of the frame, race ready, shall be 6 (six) inches. Any vehicle with sub frames, measurement will be made from lowest point of the sub-frame, and will be 4 (four) inches.

5-11 BRAKES

Four wheel brakes in proper working order are mandatory and brake rotors must be OEM and same dimension side-to-side.

5-12 FUEL / FUEL SYSTEM

Only Oxford Plains Speedway approved fuel may be used.

5-12.1 Fuel Cell

Approved fuel cell with all components is mandatory. Must be in trunk area and enclosed in a 20 gauge metal canister. Maximum capacity is 22 gallons, U. S. Measurement. Fuel cell must be centered to center line of car. A check val ve must be installed on the vent line. It is recommended that a fuel line shut of val ve be installed in the trunk area. Fuel cell must have two lengthwise and two crosswise straps to hold the cell in position. See diagram section for recommendations. Fuel cell must be a minimum of 12" off the ground.

5-12.2 Fuel Pump

Stock fuel pump only. No electric, adjustable or rebuild able fuel pumps permitted.

5-13 GENE RAL SPECIFICATIONS

5-13.1 Roll Bars

A four point roll cage made of round steel DOM or seamless 1 ¾ inch by .095 inch wall thickness roll bars are mandatory. The roll cage shall consist of 4 (four) vertical upright bars connected at the top on all sides. A "X" member must support the rear vertical uprights. 3 (three) horizontal bars are required on the left side door area and 2 (two) on the right side. (These are minimum numbers). Top hoop and uprights must closely conform to the roof line an d windshield posts, maximum of 1.5 inch space between body and cage components.

A bar at dash height across the front uprights is recommended. Safety bars may be inserted from the windshield posts directly to the angled portion of front clip only. 2 (two) bars may run from the top of the roll cage to a point that stops short of the center line of the rear end.

A bar may be installed in front of rear radiator core support and have 2 (two) braces extended no further back than in front of the upper control arm. The rear of the roll cage must be mounted a distance to be measured from the center line of rear end housing to the location point of no less than 24", plus or minus ½ inch.

Roll cage material is subject to sonic testing or inspection hole testing for compliance with the rules. A tester for analysis of roll cage strength may be used repeatedly. Vehicle must have drivers’ door plate minimum of 16 gauge, 3/16" plate maximum metal between door bars and body on driver’s side only. 16 gauge metal may be welded in between door bars and door bar connectors on driver’s side only.

5-13.2 Fire Extinguisher

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

5-13.3 Part Identification Numbers

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

5-13.4 Non-Conforming Parts Penalty

Any parts that are found to not conform with 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.

5-13.5 Declaration of Intent

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

5-13.6 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.

The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing to establish minimum acceptable requirements for such events. These rules shall govern the conditions for all events, and by participating in these events all participants are deemed to have obtained and read, and understood a copy of the current rules, and complied with these rules.