2011 Classics Rules Table of Contents

An overbore up to 0.060 is allowed on 305 cu in engines with 3.736 bore x 3.480 stroke. The driver of any engine found larger than the allowed maximum will be fined $300 and loss of all points.

CAR BODIES

All bodies must be positioned on the frame in the exact location as designed and the front firewall of body will be located at overlap seam on frame rails.
All fiberglass body must have a neat appearance and must maintain its original configuration, size and shape.
The body must maintain standard windshield opening.

FIREWALLS and FLOORS

The floors must be complete and the floor must be steel and extend from the left side to the right side.
A steel or aluminum firewall must separate the driver from the engine.*****
A steel firewall not less than 24 gauge thick must separate the driver from the fuel tank and must be sealed on top, bottom and sides. It is permissible to RIVET, bolt or weld the firewall into position.
A master switch assembly must be Ona Speedway approved.

DASH & GAUGES

The dash panel must be installed. A water temperature gauge, oil pressure gauge, RPM tech and a vision light can be incorporated in the dash panel. A tachometer is a permitted option.
A switch and starter button must be installed close to the driver in easy reach and must be grounded to metal. PLEASE NOTE: Switch assembly must be approved.

REARVIEW MIRROR

A rearview mirror is optional.
No rearview mirrors are permitted outside the car.

RADIO USAGE

Radios must be used. Track frequency is 454.0000.

WINDSHIELD

A full Lexan FMR-104 windshield must be used. FULL means covering the complete windshield opening.

SIDE WINDOW

A racing approved nylon mesh screen in the left window on the driver’s side is required.

GRILLES

Screen wire fastened to the inside of the grille.

HOODS

A hood is required and must remain to actual configuration at purchase.
Hood pins or fasteners may be used on both, front and rear hood. No cars will be allowed to start a race minus the hood. PLEASE NOTE: If a hood is lost in a racing accident it is excused and may re-enter the race. A repair or replacement of the body parts or pans must be completed by the next race.
Standard front - back up to 1 3/4 and hollow.

BUMPERS

No reinforced battering rams will be permitted.

REAR TRUNKS/DECK LIDS

Cars that have rear deck lids must use positive fasteners at the original hinge line, rear on both right and left sides. Positive fasteners must be used at standard locking area, both right and left sides.

ENGINE

Only 305 cu in Chevrolet (GM) engines permitted (Max over bore .060).

There will be a complete engine teardown for every 3rd win. (NEW)

Clarification: If you win three races, your engine gets torn down for inspection. This includes every 3rd win. Bung plug to be welded to oil pan for inspection.

No porting of manifold or polishing of intake manifold is permitted. No matching of manifold to heads.
Valve springs- must be stock GM Chevrolet or equivalent. They cannot exceed #115 on the seat when tested on the engine.
Stock #4412 two-barrel Holley carburetor required. No modification. All air leads must be sealed. Choke butterfly may be removed. $250.00 claim rule with swap applies excluding the track.
No vacuum leaks between intake valve and the top of the carburetor.
Adaptor plate and gaskets cannot exceed 1 ½" thickness.

Adapter plate may be metal or fiber.
Adapter plate between intake manifold and carburetor must be in the center of the intake manifold.
The hole in the adapter plate must be straight bore.

Clarification: No polishing of rods. No acid porting or coating of intake manifold. Intake runners may not exceed 172cc and exhaust runners may not exceed 65cc. No angle milling of cylinder heads. The GM part number on cylinder heads must end with the number 601, 450, or 416. No lightening, excessive polishing or knife edging is permitted on the crankshaft.

Intake Manifold - Stock GM spread pattern Quadra jet manifolds only cast iron or aluminum low rise. PLEASE NOTE: No bow ties high performance not after market manifolds are allowed. Quadra jet carburetor attaching bolt pattern is a rectangle with dimensions of 4 1/4 x5 5/8.
Cylinder Heads - No special after market cylinder heads are permitted. Only GM stock 305 CT cylinder heads are permitted. Only 2 valves per cylinder. Intake valve maximum of 1.840 permitted. Exhaust valve is limited to 1,500. No special valve or valve sizes are permitted. Cylinder heads are limited to a minimum of 55 CC's. No interior debarring or polishing is permitted. Studs may be pinned; poly-locks and screws in studs are permitted. The GM part number on heads must end with the number 601 or 450.
Crankshaft Pistons and Rods - Only stock 3.48 cast iron crankshaft are allowed, no racing cranks will be allowed. Only stock 5.7 GM rods are allowed. Aluminum rods and steel racing rods are prohibited. Either flat top or dished pistons are allowed. Wrist pins must remain stock GM position. Forged pistons or cast type piston are allowed. Flat top pistons must have four-valve reliefs in each piston. PLEASE NOTE: Engine block permitted minimum of .0 deck clearance.

Clarification: Any 5.7 Stock production line GM rod are allowed. Must be produced by GM.

Clarification: Only stock 3.48 cast iron crankshaft are allowed, produced by GM.

Alternate crank allowed as follows…(Eagle standard cast steel crankshaft #103503480)

Camshaft - Any flat tappet, hydraulic cam is acceptable as long as its lift does not exceed 0.280" when measured at the push rod socket. This translated to 0.420" lift at the valve. Cam may be indexed.
Valve Lifter - Lifter must be hydraulic, no Rhodes type of anti-pump lifter, no oversize lifters.
Rocker Arms - Rocker arms of stock configuration only of 1.5 or 1.6 allowed.
Engine Location - Engine must sit in the middle of the frame rails. Setbacks and offsets from radiator to fuel cell will not be tolerated. Drive shaft must measure from coupler to coupler 49 ½ + or - ½"
Engine Mounts - Engine Mounts must conform to the original standard location. Only approved reinforced engine mounts are allowed. All engine mounts must be securely bolted.
Engine Displacement - Formula for determining cubic inched bore x bore x .7854 x stroke x number or cylinders = cubic displacement. PLEASE NOTE: Any engine exceeding maximum allowable cubic inch displacement limit will cause the race driver and the car owner to be disqualified and fined. Only 305 cu in Chevrolet engines are permitted. Maximum overbore is 0.060.
Oil Pans Modified or stock GM pan ONLY. Baffles may be added.

AIR CLEANER

Only a round air cleaner element is permitted. A minimum of twelve (12) inches, a maximum of 20 inches in diameter and a maximum of five inches in height. No holes are permitted in the top cover of the air cleaner. It is permissible to shield the frontal area of the air cleaner. Top and bottom of the air cleaner must be the same diameter.
Any attached tubes or other induction system used to flow extra air into the air cleaner will not be allowed.

ELECTRICAL SYSTEM

No after market type distributor permitted. Only stock OEM HEI distributor is permitted.
No MSD hot boxes allowed.
Generator/Alternator system, if used, must be working with charge.
Self starter must be operative. All racecars must start under their own power once the race is underway. The car may be pushed by hand pushing in the pit area and down put road only, but under no circumstances is any car to be pushed onto the track from the pit area.
Aftermarket coil is allowed as long as it matched dimension of stock coil and mounts in the original location.
Battery must be located under the hood behind the seat or under the floor of the car. If the battery is located under the floor, the battery must be fully encased. Ona Speedway must approve Battery mounting positions.

COOLING SYSTEM

Water pump impellers may be altered.
Type of fan is optional.
Fan shroud may not exceed more than two inches after the fan blades.
Radiator must remain standard appearing and remain in approved position.

PLEASE NOTE: All cars should be equipped with an overflow tank securely mounted as a permanent installation. Factory installed catch pans are permitted.

OILING SYSTEM

Dry sump oiling systems is not allowed. Only standard engine oil pans are permitted.
Oil pan baffles preventing oil from flowing away from the oil pump pickup are allowed and fully recommended.
A minimum clearance from the bottom of the oil pan to the ground is four inches with the driver in the car at the end of the race.
Any engine oil is permissible.
Any oil filter cataloged for standard American manufactured automobile engines and cataloged as acceptable filters at service centers are permitted.
Remote pre pump oil systems are permissible.

EXHAUST SYSTEM

Only approved 2406 steel headers are permitted. NO CORVETTE EXHAUST MANIFOLDS ARE PERMITTED. Headers may be chromed, porcelain or wrapped.

TRANSMISSION

Only standard production 350-turbo automatic transmissions which are cataloged are available through regular dealer channels are permitted.
No shift or ranges are allowed to be blocked out. Reverse and three forward gears must be in working order. Manual valve body kits are permitted.
Transmission cooler is permitted.
Stock torque converter designed only for 350 Turbo trans only.
Vega torque converter is prohibited.

REAR AXLE

No front wheel or four-wheel drive trains are permitted.
Only steel rear end assemblies are permitted. Only GM 10 bolt Chevy (7 ½" Gear) rear end permitted. Standard equipment on metric frames.
Locked rears, welded, Detroit locker, limited slip differentials are allowed. PLEASE NOTE: No quick-change center sections or full floating rear hubs are permitted.
Rear Axle ring and pinion may be any gear ratio.
Hollow rear axles are not permitted.
The allowable thread width on rear axle assembles measured from the center of the right tire to the center of the left tire can be no more than sixty one +- ½ inch.

Clarification: No plating or drilling extra holes on rear axle. Rear axle must remain in stock position.

DRIVE SHAFTS & UNIVERSALS

Drive shafts and universals must be similar in designed to standard production type and must be made of steel.
It is mandatory that two steel brackets, no less than one inch wide and 3/16 inches thick be placed around the drive shaft and fastened to the cross member or chassis brace to keep the drive shaft from becoming dislodged.
All drive shaft must be painted white.

WHEELS

The wheels must be approved for racing and must not exceed fifteen inches.
An offset of three inches is approved for all four wheels.
Only reinforced steel wheels are permitted. All four wheels must be fifteen inches in diameter and all four wheels must be the same size at all times. Maximum rim width is eight inches.
Heavy duty lug nuts and bolts must be used.
For body clearance an exception of a two-inch offset wheel may be used on the right rear only. The maximum thread width of 61" +- ½".

TIRES

Only Goodyear race tires are allowed.

FRAME

The frame must maintain its stock dimensions when measured between the existing frame rails.
Holes may not be cut in the frame rails to lighten.
Front suspension wedge bolts are permitted. PLEASE NOTE: Only stock GM metric frames are permitted. NO special frames are allowed. 1978-1985 Chevy Malibu, Monte Carlo, Pontiac Grand Prix, Olds Cutlass or Buick Regal (GM Frame Metric Only).
No boxing or plating of the frame unless it is damaged, the frame must still maintain its original contour in all respects.
An X may be installed into the frame connecting the four dogleg corners of the frame. If X is used, it must be a minimum of 1 ½" round or square steel tubing with a minimum thickness of .080. Original transmission cross member may be removed if X is installed.

SUSPENSION

Front suspension components must remain stock for manufactures original frame being used. GM Metric Frame Only.
After market parts may be used as stock components as long as they remain the same size and they mount in stock locations.

Clarification: After market parts may be used as stock components as long as they remain in the same size and they mount in stock locations. After market tubular upper A frames are allowed (adjustable or non-adjustable), using OEM replacement type ball joints and spindles original to chassis.

No heim joints are permitted, other than those for the adjustable upper A arms or the shocks.
After marker tubular upper A frames are allowed, using OEM replacement type ball joints and spindles original to chassis.
Lower A frames must be General Motors stock Metric Frame. Springs must mount in the standard location. Front shocks must mount from upper hood bar to the lower A frame. Only one shock per wheel is permitted, steel lower bushings allowed, screw in ball joints allowed.
Upper A frames must be approved by Ona Speedway, OEM replacement type ball joint only, no monoball set-ups are allowed.
Front sway bars must consist of a one-piece standard General Motors sway bar.
Rear coil springs must mount in the original spring mounting location. Rear sway bars must be General Motor’s stock.
Both front and rear coils are classified as heavy duty racing springs.
No tubular GM sway bars are allowed. Must be GM solid stock.
Rear shocks must mount in stock location.
Rear trailing arms must be stock and mount in stock original mounting brackets.
Only one shock per wheel. No coil over shocks permitted.
Coil spring rubber inserts are permitted. No leaf spring or torsion bars are permitted.
Must use stock type rear trailing arm bushings.

Clarification: Rear shocks must mount in stock position at bottom. No plating or re-drilling holes in trailing arms. Bushings may be stock type, poly, or steel.

Welded or heim end shocks allowed front and rear

SPINDLES, WHEEL BEARING, BALL JOINTS & HUB

All spindles must be GM stock only.
Right front rotor can be replaced with a Coleman Steel two-piece rotor #140-750-1 for small bearing or #140-750-2 for large bearings.
Only steel hubs are permitted.
No steel sleeves are permitted over the spindle.
Offset spindles are not permitted.
Wheel bearings must be standard type.
Upper ball joints must be OEM replacement type.

Clarification: May use screw in, bolt on, or press in upper ball joints.

TREAD WIDTH REQUIREMENTS

All cars must maintain a maximum allowable tread width; front 62 inches, rear 61 inches +or - one half inch measured at the center of the tire, zero toe in at the spindle height.
Steel or aluminum spacers are permitted to utilize the maximum allowable tread width.

WHEELBASE REQUIREMENTS

All cars must maintain a 108-inch wheelbase.
When measuring wheelbase, one side measurement must be the allowable wheelbase. Maximum allowable tolerance cannot exceed one inch on the other side.

GROUND CLEARANCE REQUIREMENTS

Frame rail and body clearance rocker panels will be six inches with driver in car at the end of the race upon inspections.
Suspension parts clearance.

STEERING COMPONENTS

Stock Metric Frame Steering box cannot be moved from the original GM factory stock location on the frame.

Clarification: After market power steering kits or quickners may be used. Steering boxes may be stock or aftermarket but must be mounted in the original GM stock location on the frame.

All racecars must be equipped with a steel rod. SPECIAL NOTE: No rack and pinion steering allowed.
Only stock tie rods, drag links and component parts must be GM Metric Stock.
Spring loaded pin allowed in joints in steering shaft are permitted. Not more than two universal joints permitted in steering shaft.
The use of universal joints in steering shaft is permitted. Not more than two universal joints permitted in steering shaft.
The use of heim joint may be incorporated in the steering shaft.
Interchangeable pitman arms may be used.
17 inch race steering wheels are permitted.
Center top of steering post may be padded.
After market power steering kits or quickners may be used.
Collapsible steering shafts are allowed.

BRAKE SYSTEM

Disc brakes are permitted on front wheels only. Only stock type front wheel brakes are allowed.
Rear wheel brakes are drum type brakes with standard brake shoes. Positively no disc brakes are permitted on the rear of the vehicle. Brake components must be stock GM or comparable after market replacement parts.
Double reservoir master cylinder required. Brake pedal may be either floorboard type or hanging pedal. After market brake pedal assembly permitted. Master cylinder must be mounted in an approved manner.

FUEL SYSTEM

All racecars competing in this division are required to have a commercially manufactured fuel cell. The fuel cell must be encased in a metal container of not less than 20 gauge steel. The fuel cell is limited to only eight gallons including vent and fuel neck.
The fuel cell is required. It can be no more than eight-gallon capacity and outside dimensions exceed 2312 cubic inches displacement. Fuel cells must be mounted above the rear spring buckets. Fuel cells must be equipped with a check valve at filler entrance to fuel cell. This will keep fuel from spilling in case of upset.
Either or both right or left side pickup in fuel cell may be used.
Only one fuel line permitted to transport fuel from the fuel cell to fuel pump.
When fuel line is located on top of floorboard, the fuel line must be encased in a steel pipe. It is recommended that the fuel line run beneath the floorboard.
No additional lines may be used on fuel systems. Extra fuel cells or fuel lines concealed or hidden is strictly prohibited. PLEASE NOTE: To properly mount the fuel cell between the rear spring buckets, the first step is to incorporate a box like base constructed of 1" square tubing welded to existing steel metal bars.
Race fuel shall be automobile gasoline or track fuel only.
Gasoline must comply with ASTM D4814 entitles "Standard Specifications for Automotive SPARKS IGNITION ENGINE FUEL" except limited to liquid hydrocarbons only, Class A through E, free of regards to area or seasonal limitations.
Gasoline shall not be blended with aniline or its derivatives- Alcohol or other nitro compounds, no nitrogen compounds.
No pressure systems allowed. Any concealed pressure type containers, fuel fill lines, or actuating mechanism will not be permitted.

FUEL PUMPS

Electric fuel pumps are not permitted.
Only stock standard side block mounting mechanical fuel pump permitted.
After market fuel pump permitted. Provided they are the exact same size and mount in the standard mounting brackets as the original fuel pump.

OVERALL CAR WEIGHT

For all Classic Race Cars competing, all cars must weigh a minimum of 2400 pounds before and after the race with the driver. No fluids for fuel loss or sold weight may be added after the event.
No more than 55% of the total weight may be used as left side weight.
Added weight required to bring the car weight to allowable legal minimum must be a block form with no less than five-pound blocks. All added weight must be securely bolted to frame rail. Weight blocks must be painted white. No added weight will be permitted inside the racecar. Dislodged weight cannot be added to racecar after the event.
Cars will be weighed with the driver.

PLEASE NOTE: The reason for painting added blocks white is to make them visible to the other competitors when they become dislodged and may be laying on the track.

IDENTIFICATION AND MARKING

Numbers must be at least 18" high and on both sides of car on center of door. A number 24" tall must be on roof, reading from passenger side. 4" legible numbers must be on front and rear of car. Color of number must contrast with body color. No reflective numbers allowed.

DRIVER HELMETS

Driver Helmets must meet all specifications set forth by the American National Standard Institute.
Snell helmets are permissible.

SEAT BELTS and SHOULDER HARNESS

A quick release belt no less then three inches wide is compulsory. Shoulder harness and additional v-type seat belts are compulsory. Shoulder harness must be no less then three inches in width. No inertia real permitted on shoulder harness.
Both ends must be fastened to roll cage using only aircraft bolts not less then 3/8 inch in diameter.
Seat belt and shoulder harness must come from behind the driver.

RACE CAR SEATS

Aluminum racing seats are mandatory.
Aluminum seats inserted within a steel frame will be permitted.
All seat must have padded rub protectors.
Seats are not allowed to be further back then the rear hoop bar mounted 22" in front of the centerline of the rear axle. Housing cab or rear window of the car.

ROLL BARS

A round steel tubing 1 3/4 x .095 inch rollover bars are compulsory and must be acceptable to Ona Speedway officials. Aluminum and/or other soft metal are NOT permitted.
Roll bars must be welded.
All cars are required to have a rear vertical hoop behind the drivers head connected to the left and right front roll bar legs at the roof hoop. The front roll bar legs must follow the contour or the windshield post and cowl. The rear vertical hoop must be supported by a diagonal bar from top left to bottom center or top right to center left. A roll bar must connect the left and right of the rear vertical hoop at seat height and across the floor pan near the bottom. An additional roll bar must be installed across the bottom of the dashboard, extending from the left and right must extend from the top of the rear vertical hoop to the rear of the frame in the trunk compartment. The front leg bars and rear vertical hoop must be connected with horizontal bars on the left side. The left side door bars must be convex in shape and spaced from the top to the bottom as equal as space permits and must have vertical studs equally spaced. Two angular studs must be attached from the next to the bottom door bar to the mainframe rail. Right side door bars must have at least two door bars configured in an X or Y design. A vertical bar to protect drivers legs roof wedge bar, transmission hoop and drive shaft hoop are required. Left side door must have a minimum of three bars.

PLEASE NOTE: Additional bars may be added in the cage at the owner’s option.

Roll bars must be padded from top of frame on the left side to the center of the top.
Front and rear bumper supports must be 2" x3" material.
Roll bar installation and workmanship must be professionally constructed.
Only four uprights are allowed in front hoop section one each in front and behind upper control arm mounts on each side of the car.
Rear vertical hoop measured from the centerline of the rear axle must be no less than 22 inches.

FIRE CONTROL

Race car must have an approved fire extinguisher securely mounted within reach of the driver. The fire extinguisher must be mounted on an approved bracket designed strictly for the installed extinguisher. No fire extinguisher will be allowed to be taped to the roll bar.
It is recommended that at all times driver wearing driving suits and gloves of fire resistant materials that effectively cover the body.

PLEASE REMEMBER: SAFETY FIRST!!

WINDOW SCREEN

The safety window screen must be rib type made from 3/4 inch wide nylon material.
Minimum window screen size will be 22 inches by 16 inches.

NOTICE

Anything not covered by the following rules, abuse of the rules, and a creative interpretation of the rules should be checked with through the ONA SPEEDWAY TECH INSPECTORS before proceeding. Any decision on questionable items about rules is up to the EVENT DIRECTOR and the TECH INSPECTOR, and our decision is FINAL!

The above rules and specifications set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all speedway events. By participating in these events, all speedway entrants are deemed to have complied with these rules. No expressed or implied warranty of safety shall result from publications of, or compliance with these rules and specifications. They are intended as a guide towards the sport and are in no way a guarantee against injury or death to participants, spectators, or others. Note: RULES may be CHANGED as deemed necessary for the FAIR SPORT of racing.

If the rules don't say you can do or use it, YOU CAN'T!

Revised 11-6-2009