Pre-Tech Closes at: 5:30pm
EXPLANATION; Drivers must be 14 years of age or older. Drivers and crew members the age of 14-17 must have a minor release form signed & notarized by both parents or legal guardians to enter the pit area. All entrants must have a valid pit pass. The Hornet division is designed to promote greater interest in stock car competition, to enable new and inexperienced drivers to compete without spending a significant amount of money for race equipment. Decision on interpretation of the rules by the Technical Inspectors shall be final. No changes from stock production automobile or component parts except as listed in these rules. IF IT DOESN’T SAY YOU CAN, YOU CAN’T! Any equipment that the officials consider exotic or not in the intent of the rules shall be considered illegal.
1. COMPETING MODELS
A) Front wheel drive only. Two door, four door cars are acceptable Vans and Station Wagons are allowed.
B) No convertibles or T-tops.
2. ENGINE SPECIFICATIONS
A) Stock Motors, 4-cylinder - no modifications. No turbos. Must be single cam, 2 or 4 valves per cylinder.
B) Dual overhead cam motors may be subject to weight penalty no less than 100lbs mounted in the center of the car.
C) Stock ECU no chips or programing allowed.
A) Manuals or Automatics must remain stock and stock parts including stock clutch parts.
A) Must be stock, that includes doors. No lightening allowed except for the hood and front doors. Doors may be gutted to allow for door bars. No interior or exterior mirrors. Burnable materials must be removed from the inside. All glass, except windshield, must be removed. Windshield may be replaced with 3/16” Lexan and large pop-rivets All exterior lenses and emblems must be removed. Cars with sunroofs are required to cover hole with 20-gauge sheet metal. Beginners must have third brake light. All cars must have 20” tall numbers on both sides and roof. Hood and trunk must be secured with hood pins only; stock hinges can remain.
5. BRAKES & SUSPENSION
A) Four-wheel stock foot actuated brakes are mandatory – no modifications. All brakes must work.
B) Right front notching of strut tower bolt holes is permitted.
C) No other suspension modifications allowed.
D) Right front camber shall be 6 degrees MAX. Measured with MVSO tools.
E) Left Front and both rear shocks/struts shall be in stock location
6. ROLL BAR
A) 4 point 1-3/4” .090 tubing roll cage required. Must have 3 door bars on driver side and 2 on passenger side. Technical Inspectors approval.
A) Head and neck restraints are highly recommended e.g. (HANs or Hutchens Devise)
B) 5-point harness is mandatory. Belts must be secured to the roll cage. No mounting to the floor pan. Belts must be dated by the manufacture and must not be used beyond 5 years past manufacture date.
C) Fire suits are mandatory.
D) Driver’s window screen or window net.
E) Helmet. Full face helmet. No open face or motocross.
F) Neck Rolls are mandatory, if not using head & neck restraint.
G) Leather gloves or racing gloves. Leather boots or racing shoes.
H) May have cutter blade or rub rail running from fender to rear quarter, at the center of the door. No sharp edges. Doors must be welded bolted or chained shut.
I) Race cars must have fire extinguishers securely mounted within reach of the driver. The extinguisher must be mounted on a metal mounting bracket (no extinguisher may be taped to roll bars).
J.) Battery may remain in engine compartment and be securely fastened down. Or relocated to rear but must be in covered battery box and bolted down
K) A clearly marked Master Battery shut-off switch within 6 inches of the center of the car must be installed and hooked to negative post on battery. Emergency Responders must be able to reach the switch from both sides of the car. A brightly painted, solid square of at least 4 inches square must surround the switch. The shut-off switch must be operational at all times.
L) Aluminum racing seats are mandatory.
M) Must use a dry cell battery.
N) All roll bars within reach of driver’s hand, feet or legs must have roll bar padding.
O) Racing fuel cell is recommended and will be mandatory in 2021
8. WHEELS & TIRES
A) 60 Series or larger. No racing tires. Must be DOT street tires.
B) Must be OEM tire size. All tires on vehicle must be same size.
C) Wheel weights must be removed.
D) Must be stock steel wheels. No racing or offset allowed.
A) Removal of the muffler is ok.
B) Exhaust must run past driver’s seat.
A) Mirrors are permitted on the left outer side of the car with a 4inch max diameter. Track Officials reserve the right to ban the mirrors if they see fit for any reason at all.
The tech officials reserve the right to assess penalties as needed to ensure that the competition is close.
The Hobby Stock division is designed to promote greater interest in stock car competition, to enable new and inexperienced drivers to compete in their own class. It enables individuals with moderate means to compete without spending a significant amount of money for race equipment. Decisions on interpretation of the rules by Technical Inspectors shall be final. No changes from stock production automobile or component parts except as listed in these rules. If it doesn't say you can, you can't. Any equipment that the officials consider exotic or not in the intent of the rules shall be considered illegal.
How The Weight System Works...?
The goal of this system is to allow all cars that fit the various definitions of a Hobby Stock to compete legally, and balance the competition using weight. The first time a new car arrives at the track the tech official will ask the driver a series of questions about the specs & technology used in the engine and throughout the chassis. The Tech official will fill out the weight slip according to what the driver has stated. All of the elements covered on the weight slip are subject to tear-down at the end of the Main Event upon MVSO official request to ensure proper compliance. If a driver adds new technology, it is the responsibility of the driver to notify tech of the change and get an accurate weight slip. Any car found to be in violation of the weight guidelines will be subject to immediate disqualification and will receive last place points and money, any records achieved that night will be stricken from the records. A second offense will result in disqualification, No Point and No Pay. Weight slip shown below must be located on the upper left or upper right corner of the windshield or on the driver’s side sail panel of the car. It is encouraged that drivers who build cars specifically for this series consider Performance Vs Reliability and racecar sophistication vs the benefit of being light weight.
1. COMPETING MODELS:
Open to all American and Canadian made steel bodied passenger cars, 1960 and newer. No station wagons, Jeeps or convertibles. No front wheel drive, rear or mid engines allowed.
2. GENERAL SPECIFICATIONS:
A) Minimum ground clearance of all components is 5”. All measurements will be made with driver in the car.
B) Body and frame must match, make to make, model to model, year to year.
C) Control arms may be welded to strengthen.
D) Over 108” Wheel Base permitted with no weight penalty. 101” Minimum. Cars with wheelbase 114” or longer get 56% left side weight.
3. ENGINE SPECIFICATIONS:
A) Stock production V-6 or V-8 engines only. No engine interchange between makes, (must be Ford to Ford, GM to GM). Engine must have been available to the general public to purchase. GM 602 crate motor permitted in all cars
B) Engine must be stock OEM. All internal parts must be OEM replacement part for make of engine except as noted.
C) Engine may be set back so furthest forward spark plug is even with spindle centerline. Front motor mount may be after market with no rubber, rear mount must be OEM transmission location may be without rubber.
D) Stock flat top OEM type replacement pistons only, may over bore of .060”. Pistons may not exceed deck height. No racing pistons.
E) Hyper-Eutectic, Molly-coated allowed on skirts only. No other coating. TRW, Seal power and Keith Black are the only forged pistons allowed. 5/64, 5/64, 3/16 rings only. Full skirts only.
F) Factory OEM “as produced” Stock steel rods. May use aftermarket rod bolts. Must be “as produced” bore, stroke and rod length combination. Crankshaft may be steel or cast.
G) Any flat tappet hydraulic camshaft. No solids, mushroom or roller camshafts.
H) No gear drives. No aftermarket distributors. OEM HEI ignition systems are approved. GM style HEI distributors approved.
I) Cylinder head casting must match engine displacement as produced with these clarifications: 461 castings, 1.94 intake Camel hump heads including 041,492 and 186 are acceptable on 350’s not 400 Chevys, 289 head permitted on 351w. The following aftermarket direct replacement stock cylinder heads are allowed with weight penalty: Chevy heads/part # 042660-1(assembled) #042660 (bare) Ford heads/part # 053030-1 (assembled) #053030 (bare)
K) Chevy Vortec, or X heads are not permitted.
L) Restricted to 2.02 valve size. 3 angle valve jobs permitted. Only rebuild standard allowed is 30, 45 and 60 degrees. Poly-locks are permitted.
M) Screw-in or pinned studs, push rod guide plates are approved.
N) No stud girdles.
O) Chevrolet only allowed 1.5 rocker arms. Mopar and Ford adjustable rockers are allowed. Roller rockers are allowed with weight penalty. Must be factory rocker armratio.
P) No porting, polishing or gasket matching of heads.
Q) Exhaust manifolds must be stock cast iron OEM or stock replacement only, from a standard production car. Chassis or block headers are allowed with weight penalty. Maximum 2 1⁄2” exhaust from the headers/manifold back.
R) Fuel pump must be stock OEM type and mount in stock location. No electric fuel pumps allowed.
S) Stock steel or cast iron flywheels only. No aluminum flywheels allowed. No Corvette modular iron flywheels. Stock OEM type pressure plate and OEM Single disc clutches only.
T) Crate Engine Program:
1. GM 602 is the only legal crate engine.
2. Box stock Holley 650 cfm 4777 series carb only.
3. 602 Crate Carb PN: 0-80541-1 HP legal with weight penalty.
4. No modifications permitted.
5. No rebuilding engines – factory seals must remain intact. Exception below.
6. Tech officials reserve the right to inspect the internal components of crate engines only under paid protest from another driver. Engine will not be disassembled until new GM seal kit is present.
4. CARBURETOR AND INTAKE MANIFOLD:
A) Holley 500 CFM #4412 only. Only choke and related parts may be removed.
B) No tubes, funnels, or any other devices which may control the flow of air is permitted inside of the air cleaner or between the air cleaner and the carburetor.
C) A one piece 1-5/8” maximum in thickness carburetor spacer acceptable to Tech Inspectors is allowed.
D) Stock cast iron automotive 2 barrel or 4-barrel intake with adapter. No high rise or GM Z-28 replacement manifolds of any kind permitted.
E) No porting, polishing, acid dipping, adding epoxy or similar substances allowed on intake. No gasket matching allowed.
F) An air cleaner is mandatory at all times. No foam type air cleaners. Top and bottom of air filter housing must be solid and be same diameter, K&N filter element OK. It is permissible to attach a shield in front of the air filter housing up to half the air filter circumference. It cannot be higher than the air filter element. No air boxes.
A) A stock OEM automatic transmission, with a stock working torque converter is permitted. Three and four speed manual transmissions with all gears working is permitted.
B) Transmission must bolt to engine with no modifications.
C) All cars with manual transmissions must have an approved scatter-shield around clutch, or a constructed shield made of a minimum of 1/4” steel over the bellhousing section of the floorboard.
6. DRIVE SHAFTS:
A) Drive shaft and universal must be similar in design to standard production type. Only a one-piece steel drive shaft is permitted.
B) It is mandatory that two 160-degree solid steel brackets, no less than 2” wide and
1/4” thick, or steel chain, be placed not more than 12” from each universal joint and fastened to the floorboard.
C) All drive shafts must be painted white.
A) Bodies must be OEM steel and must remain stock.
B) All glass must be removed except the front windshield. All chrome strips, door handles and other items must be removed. All upholstery, sound deadening, door panels, headliner material, carpeting, floor pads and seat must be removed. A Lexan rear window is optional.
C) All body panels must remain stock and intact. Hood, roof and rear deck lid may be lightened. Front door panels may be cut out only if door bars are inside of door. Rear inner fenders must remain enclosed. Front inner fenders may be removed. Center of trunk may be removed for fuel cell installation only. Must have trunk floor, but rear inner fender wells can be removed. Cockpit needs to be sealed for fire protection and may be non-OEM but must be made of 22-gauge steel minimum.
D) Bumpers must be strapped to the body. Bumpers may be reinforced within confines of original bumper. Front and rear aftermarket bumper covers allowed. Fabricated bumpers must be a minimum of 3” wide and resemble the stock installation.
E) No sharp edges. All edges must be rolled under.
F) Full floor boards and firewalls required. All holes must be covered with a minimum 22-gauge sheet metal.
G) Doors must be welded or bolted shut.
H) Hooks suitable for towing must be welded to the underside of all 4 corners of the car.
I) A non-adjustable rear spoiler, not exceeding 4” in height and not wider than the rear deck lid may be attached to the rear deck lid. (It is recommended that the spoiler be made of 1/4” clear Lexan). No rudders or forward brackets are allowed.
J) Rub rail permitted
Mirrors are permitted on the left outer side of the car with a 4inch max diameter. Track Officials reserve the right to ban the mirrors if they see fit for any reason at all.
A) Radiator must be mounted in engine compartment.
B) Aftermarket and aluminum radiators are permitted.
C) All cars will be equipped with a minimum 2-quart over-flow can.
D) Electric fans approved.
A) All suspension components must be OEM for make (Ford to Ford, GM to GM) with no modifications except: right front may have longer bolts or elongated holes to obtain camber.
B) Springs must be OEM type. Springs may be cut and/or bent.
C) One shock per wheel. Shock mounts may be extended along original axis to allow use of long body shock. All shocks must be stock OEM appearing.
D) OEM front and/or rear sway bars are permitted. Must be mounted in stock holes.
E) Front spindles may be interchanged within manufactures line to allow disc brakes on early chassis only.
F) Lowering blocks and solid spring spacers are approved for use. No twist in spacers. Front spacers may be threaded but located around shock (coil only); rear coil spacers may be a solid type. May be interchangeable. Leaf spring cars may use either lowering plates under leaf springs or screw type as long as the u bolts have to be loosened and re-tightened in order to make height adjustment. No cam-actuated front to rear adjusters for rear alignment allowed. Adjustable shackles permitted on rear leaf spring eye only. Sliders permitted but must be bolted to mounting plate with shims adjustment.
G) Metric cars may use older Nova spindles.
H) OEM rubber bushing only on rear, any bushing material on front
11. REAR ENDS:
A) Differential may be locked by welding or shimming spiders. Mini spools, OEM “posi” and limited slip differentials are approved for use. Full spools allowed.
B) Rear end must be in stock location and must use all stock parts for attachment.
C) No cambered axle housings. No gun drilled axles. Aftermarket axles highly recommended. C-clip eliminator allowed.
D) Ford 9” rear end allowed: must have drum brakes, no nodular, no aluminum, must have stock housing. Mini spools and full spools allowed. No floater rear-ends.
A) Four wheel, stock, foot actuated brakes are mandatory. Adjustable proportioning valves may not be used. All brakes must work.
B) Must be solid mount. No free float. No drilled rotors.
C) Master cylinder must be OEM and mount in stock location.
D) Stock pedal assembly must be used and may not be moved or extended.
13. ROLL BARS:
A) Round steel tubing 1 3/4” x .090 inch or 1 5/8” x .120” minimum seamless roll- over bars are compulsory for the basic roll cage and must be approved by the Tech Inspectors. Aluminum and/or other soft metals are not permitted. Roll bar connectors must be welded.
B) For approved location of the various roll bars, please reference the basic roll cage diagram (some bars have been removed for clarity) in the back of this book. On unitized bodied cars, the cage must be attached to 6” square plates, minimum 3/16” thick. The plate must be fish-plated to plates with the same specifications by four 3/8” bolts. Maximum ¾ offset cage.
C) A minimum of 3 door bars are required on the left side with 2 bars required on the right side. The left side door bars must curve to the outermost part of the door skin. It is required that a piece of 1/8” steel be welded to driver’s side door bars. The material should be placed between the door skin and cover the seat area. As an option, the material may be welded between the door bars.
D) A dash bar connecting the front cage uprights is required.
E) A wing window bar is required on the driver’s side and must be of approved roll bar material.
F) Only two bars (one on each side) may pass through the front firewall. The bars will attach to the front roll cage legs and attach to the radiator protector bar, with additional supports. Two bars may attach to the rear roll cage legs and must extend past the fuel cell. No bars from inside 4 point to beginning of front kick-up forward.
G) All roll bars within the driver’s reach, hands, legs and feet along with the steering wheel hub, must be padded acceptable to the Tech Inspector.
H) No bars, no x-ing or tying frames together under car. Cars with bolt-on sub-frames may use connectors. Connectors must only run parallel to wheelbase. No X-ing outside the 4 point.
14. RADIATOR PROTECTOR:
The radiator protector will consist of a maximum of 5 bars (1 1/2” ID, schedule 40 tubing maximum material), located in the following positions: Two bars upward from the frame horns, one bar across the front of the radiator, two bars mounted in front of A-frames and connected to upright bars.
15. FUEL CELL PROTECTOR BAR:
If the fuel cell is installed through the trunk floor, the car must have a bar installed at the rear of the fuel cell. The bar must be a minimum of 1 3/4” x .090 thickness and must attach to the frame rails and extend down and across the bottom of the fuel cell, with a center support bar that attaches to the rear cross member. (Protector bar is not required if fuel cell is installed above the floor of the trunk.)
16. WINDOW SCREEN:
A nylon window screen must be installed in the left side glass opening. The minimum window screen size shall be 22” wide by 16” high. All window screen mounts must be welded to the roll cage. The window screen, when in the closed position, must fit tight and be secured with a quick release type lever.
A) Fuel shall be automotive gasoline only.
B) The gasoline shall not be blended with alcohol, ethers, or other oxygenates and it shall not be blended with amine, or its derivatives, nitro compounds or other nitrogen containing compounds.
C) The Speedway reserves the right to require all cars to use the same fuel.
18. FUEL CELL:
Tech Officials will reject any previously approved fuel cells, containers, or check valves which appear to be damaged, defective, or do not function properly. Fuel cell vent check valves are compulsory. No pressure systems allowed. Any concealed pressure type containers, fuel lines or actuating mechanism will not be permitted, even if inoperable. The use of a commercially manufactured fuel cell is mandatory.
A) The maximum fuel capacity shall be 12 gallons and may not weigh more than 25 pounds’ empty, including mounting hardware.
B) Must be mounted in center of trunk, a minimum of 12” ahead of rear bumper.
C) Fuel lines must run under the car and be securely fastened to the frame. Grommets are required where passing through the trunk.
19. FUEL CELL AND FUEL CELL CONTAINER INSTALLATION:
The use of an approved fuel cell and container is mandatory. The fuel cell and fuel cell container shall be installed in accordance with the following requirements
A) Fuel cell and fuel cell container may be fastened to the frame in a recessed support frame.
B) Fuel cell and fuel cell container must be installed as far forward as possible in trunk compartment.
C) Fuel cell and fuel cell container, installed in trunk compartment, must be secured with steel tubing no less than 2 lengthwise and 2 crosswise evenly spaced across the top. Tubing must be made of 1”x1” x .065 thick square steel tube. The support frame must be constructed using 2 tubes that are welded to and extend from the left side to the right side frame rails. Three tubes must be equally spaced across the fuel cell container. These tubes must be welded to the cross support tubes and extend down the front sides, rear sides, and under the fuel cell container.
D) A firewall free of holes must be located between trunk and driver.
E) The bottom of the fuel cell cannot be lower than 10” from the ground.
A) Eight-inch maximum width steel only, white spoke or equivalent.
B) Maximum offset is 6”, measured from bead of tire to lug nut seat.
C) Wheel studs will be a minimum of 1/2”. Stud must pass completely through nut when wheel is tight.
D) Maximum up to 1-inch wheel spacer allowed if 5 inch or less offset wheel is used. Any spacer over 1 inch must be approved by tech official for suspension clearances only.
E) No bleeders.
21. TIRE RULE:
1) Class Tire: HOOSIER 970 OR AMERICAN RACER 970.
22. HELMETS & NECK ROLLS
Neck rolls are MANDATORY! HANs or Hutchens Devise are suggested. It is recommended that all helmets meet the specifications set forth in the Federal Motor Vehicle Safety Standard regulations or the American Standards Institute, Inc. Snell 90 minimum.
A) Aluminum racing type seat only. No fiberglass or stock bucket seats.
B) It is recommended that all seats have padded rib protectors and seat leg extensions on both sides.
C) A padded head rest approved by Tech Officials is required.
D) Seat and seat belts must mount to the roll cage, not to the floor pan. Must use Grade 8 bolts and large flat washers.
24. SEAT BELT AND SHOULDER HARNESS:
A) A quick release lap belt no less than 3” wide is compulsory. Both ends of the lap belt must be fastened to the roll bar with high quality bolts, not less than 3/8” in diameter.
B) Shoulder harness must be no less than 3” wide and must come from behind the driver’s seat. Where the harness crosses the roll cage, it must pass through a steel guide welded to the roll cage, that will prevent the harness from sliding from side to side. Shoulder harness inertia reels cannot be used.
C) A center (crotch) belt must be securely mounted to lower seat frame at the bottom.
D) Where the belt passes through the seat edges, it must have a grommet installed, be rolled, and/or padded to prevent cutting the belt.
E) All seat belts and shoulder harnesses must connect at the lap belt with an approved quick release buckle.
F) Seat belts must be dated by the manufacturer and must not be used beyond 5 years after the manufacture date.
25. ELECTRICAL SWITCH LOCATION:
A clearly marked Master Battery shut-off switch within 6 inches of the center of the car must be installed. Emergency Responders must be able to reach the switch from both sides of the car. A brightly painted, solid square of at least 4 inches square must surround the switch. The shut-off switch must be operational at all times.
A) A steel quick release steering wheel is strongly recommended.
B) Center of steering wheel hub must be padded acceptable to Tech Officials.
C) Tilt steering wheel may be removed. Straight collapsible shaft permitted.
D) Factory Steering Box Only. Aftermarket steering quickener permitted. No Rack & Pinion Steering.
Race cars will not be permitted to carry onboard computers, micro-controlled processors, recording devices, electronic memory chips, digital readout gauges or traction control devices.
A) All cars shall be equipped with exhaust systems, including mufflers with no leaks or holes.
B) No cars shall exceed 92 D.B.A. at 100 feet.
C) Maximum exhaust shall be 2 1/2” I.D. Exhaust pipes must extend past drive and exit between door and the rear tire. Any exhaust above 2 1⁄2” subject to 25 lbs. weight penalty.
A.) Battery may remain in the engine compartment, be securely mounted in an enclosed box and accessible from under the hood or relocated inside of car. If inside of car, it must be securely mounted in a protective container. It can be no further back than the stock rear firewall and cannot protrude through the floor. The battery box will be six sided and not significantly larger than the battery. A clearly marked Master Battery shut-off switch within 6 inches of the driver’s door must be installed. Emergency Responders must be able to reach the switch. A brightly painted, solid square of at least 4 inches square must surround the switch.
B) Dry-Cell Battery Required
A) A minimum 24” high, 3” wide number is required on the door area (and only on door area) of both sides of car. A minimum 30” high, 3” wide number is required on the top of car facing the right side.
B) 5” high number is required on upper right-side windshield.
C) A minimum 8” high white number is required on the upper right corner of the windshield.
D) Numbers will be assigned by the Speedway office and must be renewed each year.
31. FIRE CONTROL:
A) Race cars must have fire extinguishers securely mounted within reach of the drier. This extinguisher must be mounted on a metal mounting bracket (no extinguisher may be taped to roll bars). It is strongly recommended that each car have built-in fire extinguisher equipment, but it cannot be of the dry powder type. ALL ENTRANTS SHOULD HAVE IN THEIR PITS AT ALL TIMES A FULLY CHARGED 15 POUND CAPACITY DRY POWDER FIRE EXTINGUISHER OR ITS EQUIVALENT, SHOWING CURRENT INSPECTION CERTIFICATE.
B) It is mandatory that, AT ALL TIMES, suits of fire retardant material that effectively cover the body from neck to ankles and wrists, along with fire retardant or leather shoes and gloves, to be worn on the racing surface. It is strongly recommended that at all times drivers wear at least a 4 layer driving suit made of fire retardant material that effectively covers the entire body. It is also strongly recommended that drivers wear long underwear, headgear, gloves and socks made of fire retardant material.
C) It is strongly recommended that at all times while the car is being refueled or while fuel is being transported from the pit area, all crewmen involved should wear at least a 4- layer suit made of fire resistant material that effectively covers the body. It is also strongly recommended that the crew members wear long underwear, headgear, socks, gloves and shoes made of fire resistant material, plus protective eye wear.
D) NO ANTIFREEZE; NO SYNTHETIC OILS OR ADDITIVES IN THE OILS
E) ALL SAFETY REQUIREMENTS ARE MANDATORY.
It is the responsibility of each competitor to read and understand the contents of these rules. 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 are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such event. These rules shall govern the condition of all points events, and by participating in these events all participants are deemed to have complied with these rules. If there is a disagreement or dispute regarding the meaning or application of these rules, the decision of the MVSO Director, and MVSO Tech Official shall prevail.
For all safety devices it is the responsibility of the driver (not the MVSO, its officers, or its agents) to ensure his/her safety device systems are correctly installed, maintained, and properly used at all times. As with all safety items, MVSO strongly recommends that the driver carefully study all manufacturer’s installation and usage guidelines and adhere to these recommendations to the highest extent possible. No pretense is made for having designed a fool-proof set of rules and regulations. MVSO reserves the right to alter, or amend, the rules and regulations in the interest of safety, cost control, and/or fair competition.
The spirit and intent of the rules in the standard by which MVSO events will be governed. The MVSO Tech Official is authorized to decide if an equipment change or modification is an attempt to circumvent these rules.
The MVSO Tech Official can, and will, disqualify a race car in violation of spirit and intent of these rules. Disqualification results in loss of payout and points. If this rule book 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 the Yakima Speedway by passing through prior technical inspection. The MVSO Director and Tech Official shall be empowered to permit reasonable and appropriate deviation from any of the specifications here in, 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 or specification. Any interpretation or deviation of these rules is left to the discretion of the MVSO Tech Official and or MVSO Director. Any form of open degradation at a race event or on social media to, or about, a MVSO Official will not be tolerated. This behavior is determined to be detrimental to the series as a whole. Failure to adhere to these rules, will be grounds for probation and/or suspension from events in this class. In addition, the driver/owner is responsible for the actions of his/her pit crew and will be held accountable. The Officials will be as professional as possible, we would like our race teams to do the same.
WEIGHT PENALTY & WEIGHT BRAKE
SUSPENSION*NO SPRING PRE-LOADERS*
Any OEM or aftermarket transmission allowed.
CARBURETORS ALL CARBS MUST BE TOOL LEGAL
FUEL CELL NO H2O FUELS-FUEL SAMPLE WILLBE DRAWN.
AMERICAN RACER 970 is the series tire. (HOOSIER 970 is also approved for use with an additional $10.00 fee per tire. The $10.00 fee will be added to the class points fund at the end of the season).
Soaking, softening, shaving, or otherwise altering the composition of tire is not permitted. NO TIRE BLEEDERS ALLOWED. Max left side tire psi 25max right side tire psi 30 max pre-tech. Cars must start heat races and the main event on the same tires on which they qualified. If a problem arises with your qualifying tires, and change is needed:
A. Replace with new tire, forfeit starting position, and start in rear of field.
B. Replace with used tire approved by tech official, keep qualifying position.
C. Only 15”by 10” steel wheels are permitted.
D. Maximum track width permitted for vehicles with 15” X 10” steel wheels is 69” stock clip, or 67” fab clip front or rear. Measured at spindle height with our referee.
HELMETS Head and neck restraint devices
The rules and/or specifications set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. By making application for a competitor permit, it is deemed that the competitor agrees to become familiar with these regulations and abide by the directions set forth and prescribed by Management. No express or implied warranty of safety shall result from publications of, or compliance with these rules and/or specifications. They are intended as a guide for conduct of the sport and are in no way a guarantee against injury or death to participants, spectators or others.
THE INTERPRETATION OF THESE RULES WILL BE SOLELY THE JUDGMENT OF THE TRACK OFFICIALS & TECH STAFF IN CHARGE AND THEIR DECISION WILL BE FINAL.