Mountain Valley Raceway

2019 Hobby Stock Rules

 

A. Safety Equipment/Gear

1. Seats

1-A Aluminum high back seats only. No homemade aluminum, plastic or fiberglass allowed.

1-B Seats must be mounted to the roll cage only, not on the floor pans. Seat must be bolted in using at least four (4) 3/8” minimum hardened bolts at a minimum of four (4) points to the roll cage or frame structure.

1-C Upholstery and padding suggested.

2. Seat Belts

2-A 5 pt. quick release restraint system three (3) years or newer required. Faded or worn belts must be replaced no matter the age.

2-B Quick release lap belt, shoulder harness and crotch belt must be no less than 3” wide.

2-C All seatbelt components must be mounted to the roll cage separate from the seat with a minimum of eight (8) 1/2” grade bolts. Belts must be mounted correctly. Belts must come from behind driver/passenger. Mounting position is important. Shoulder belts should be mounted 4” below shoulders and lap belts should be mounted the same width of the driver/passenger belts. The belts must be worn at all times while the car is on the track. Only exception is while picking up your trophy.

3. Window Nets

3-A Driver and passenger (if equipped) side window nets required. Window nets must be equipped with quick releases. The nets must be a minimum standard 16x20” ribbon or mesh style and must be mounted to the roll cage accessible by the driver and safety crew. Window nets must be in good condition, be three (3) years old or newer, and must detach from the top.

4. Roll Bar Padding

1-A Roll bar padding must be fire retardant. No foam pipe insulation and no pool noodle foam. Roll bar padding must be on all roll bars around driver/passenger head area. It must also be installed where driver/passenger can reach. By you legs is also suggested.

5. Fire Extinguishers

5-A If no on-board fire suppression system has been installed, then one (1) minimum 2.5 pound dry powder fire extinguisher must be mounted within the drivers’ reach in an approved quick release mounted bracket.

5-B Must have a minimum 2.5 pound (preferably greater) fire extinguisher in every pit. Preference would be one (1) per race car. The fire extinguishers must be maintained in a fully charged and up-to-date condition.

6. Helmets

6-A DOT approved full face helmets with face shields are mandatory. Valid SA 2010 allowed. SA 2015 dating is preferred.

6-B Buckle and strap must not be worn or frayed. Helmet must be worn and fastened at all times while on the track. The only exception is while picking up trophies.

6-C Neck collars are highly recommended.

7. Suit

7-A One piece or two piece racing suits are allowed. Suits must be in good condition with no holes or tears. Every driver/passenger must wear a fire resistant racing suit. Single layer suits are allowed.

7-B Nomex style socks, underwear, hood and shoes are recommended.

8. Gloves

8-A Racing gloves are recommended.

9. Shoes

9-A Racing shoes are recommended.

 

B. Chassis

1. Any 1955 or newer American-made passenger car is allowed. Vehicles not allowed are 4-wheel drives, sports cars and/or convertibles. Station wagons are allowed.

2. Unibody cars must have 2” x 4” minimum sub-frame connectors. Material .095 minimum.

3. No intermixing of body and frame parts. (manufacturer to manufacturer only). Swapping engines is allowed. Engine must be GM to GM or Ford to Ford, etc.

4. Vehicles must be de-chromed and all glass and flammable material must be removed except gauges and bumpers. No mirrors are permitted.

 

C. Body

1. Body panels must be stock, metal only. No aluminum or plastic except on noses and/or tails.

2. Body must be securely mounted to the frame from the rear of the driver forward.

3. Firewall must be stock or 18-gauge sheet metal to replace damaged firewall in stock location and to cover all holes for fire protection to drivers’ compartment.

4. Gutting panels are limited to hood, trunk lid, roof, doors, fenders and trunk area past the rear axle.

5. Floor pans must be stock or 18-gauge minimum from the rear of the drivers and passenger seat forward. Must be welded or bolted. If welded, welds must be 3” long and 7” between each weld minimum. Full weld is preferred.

6. Outside iron rails, nerf bars, rub rails are allowed. Maximum of 1-1/2” x .095 tubing or 1” x 2” rectangle tubing. Nor more than a 1” gap between the rub rail and body skins. Maximum length outside from from fire wall to rear firewall/rear compartment divide. Ends must be tapered and capped.

7. Fenders may be cut to give 4” clearance above the tires. No protruding edges allowed.

8. Hoods and trunk lids must be secured at all four (4) corners. Hood must be in place to start a race. No hood - No start.

9. No plexiglass is allowed on car anywhere.

10. Car must have a minimum of half the windshield area in front of the driver and full windshield, if passenger, covered. There must be a minimum of three (3) posts or straps located in front of driver (and passenger). Posts/straps must be securely attached to the body of cage. Must be made of a minimum of 1/2” tubing or 1/8” x 1” flat bar. (1/2” rebar is preferred). Wire mesh/expanded metal of 1/4” to 3/4” squares must cover drivers’ side (and passenger side) and be completely and securely attached.

 

D. Numbers

1. Cars must have clear and contrasting numbers on both doors and on the roof. Minimum size of numbers is 18” tall and 2” wide on the doors and 24” tall and 3” wide on the roof. If a car has a front and/or rear nose cover, at least one 10” tall and 1” wide number. REMEMBER, points will only be scored if the scorekeeper can clearly see your numbers from the top of the grandstands. A 3” drivers’ name on the roof is optional but preferred.

 

E. On/Off Switches

1. Cars must be equipped with an on/off switch for starting the car and clearly market “on/off” and be easily reached by driver and safety crew.

2. Car must be equipped with a battery on/off switch clearly marked “battery on/off” and be easily reached by driver and safety crew.

3. Car must be equipped with a fuel shut off if an electric fuel pump is used. It must be clearly marked “fuel on/off” and be easily reached by driver and safety crew.

 

F. Weight

1. All added weight must be painted white with the car number marked on each piece. Weight must be securely fastened. Minimum of 1/2” hardened bolts must be used or welded on. Weights must remain inside the bodies on not on bumpers. Maximum of 25 lbs. per mount. Multiple mounts are allowed.

 

G. Towing

1. Tow points on the car must be clearly marked as tow areas. Tow point must be secure enough to tow the car. Loops of chain are allowed.

 

H. Roll Cage

1. Roll cage shall be a full cage type. Minimum of 6-point cage inside. Mild steel .095 wall minimum by 1-1/2” or 1-3/4” (preferred). A full loop from frame over the driver and/passenger must be attached to a full loop surrounding roof line. Cage must be within 3” of top and 6” of sides.

2. Cage must be welded and/or bolted to the frame. If bolted, must use 1/2” hardened bolts minimum. Cage may not be welded to the floor pan. If bolted to the floor pan there must be a minimum of two (2) 6” x 1/8” square plates with four (4) bolts on each down bar. (One (1) plate on each side of the floor plate). Minimum of four (4) down bars.

3. Cage to be above driver/passenger helmet by 2” minimum clearance.

4. All “T” intersections of cage must be gusseted and welded.

5. Inner cage must have a minimum of four (4) horizontal bars on the drivers’ door within 3” of door. Minimum of three (3) uprights, evenly spaced between each horizontal bar to protect drivers’ hips and legs. A minimum of 1/8” plate attached to driver door bars to cover all four (4) horizontal bars.

6. If set up for a passenger, cage must be built the same as drivers’ side. If no passenger set up, only three (3) horizontal bars and no plating is needed.

7. There will be two (2) bars angled from the top of inner cage towards the rear end. These can extend past the rear axle to frame rails. Crossed or “X” pattern preferred.

8. Front hoops will be allowed inside body, behind bumpers to protect the radiator. Cage may go through the engine compartment. Radiators must be in stock location.

9. Drivers may be asked to drill a 1/4” hole on the cage somewhere for inspection.

10 All welds must be neat and complete. Popcorn welds will not be accepted.

11. Roll bar padding must be fire resistant. No pool noodles or pipe insulation from a hardware store. Padding must be installed anywhere driver/passenger is able to reach and completely around head/helmet areas.

 

I. Engine

1. Block

1-A Cast iron block and heads only. Engine must remain in stock location. Centerline of crankshaft may not vary more than 1” from centerline of front stub. Engine shall remain stock. No strokers allowed.

2. Rods

1-A Replacement rods only. No “H” beam rods allowed. Stock length of 5.7” max.

3. Pistons

1-A Stock replacement cast or forged only as normally used in rebuilding.

1-B Pistons may not protrude above block deck. Cast or forged allowed.

4. Cam

1-A Any stock hydraulic cam and lifters. 500 lift. No roller on solid cams.

5. Cylinder Heads

1-A Must be OEM cast iron heads only. 100% stock and (stock valve angle. No Dart, World or other aftermarket heads allowed) however angle plug heads are allowed.

1-B All casting numbers must remain visible. Stock diameter valves and springs for cast numbers only. No oversize valves and springs.

1-C No grinding, porting, polishing, gasket matching, etc. allowed. No angle milling of heads allowed.

6. Carburetor

1-A A Holley 4412, 350 or 500 may be used on any motor. Choke tower must be in place. Choke may be removed. Carburetor may not be modified internally with the exception of jets and power valve.

1-B Must have two (2) return springs. Must have toe strap on throttle pedal.

1-C Maximum 1-1/2” spacer plate allowed. Carburetor must mount to manifold without any modifications to the manifold or the base plate of the carburetor.

1-D Must pass (Go-No Go Gauge) max venturi diameter 1-3/8”. No oblonged venturi openings.

7. Intake Manifold

1-A Any OEM cast iron two (2) or four (4) barrel intake. Aftermarket aluminum intakes limited to: Chevy - Edelbrock Performer P/N 2101, 2701 EPS 2703, EPS 2716, EDL 2116; GM: P/N 12486570, Summit P/N 226018, 12366573; Ford: Edelbrock Performer P/N 320-3721, 351-2181; Chrysler: Edelbrock Performer 318-360 P/N 2176. No “Air Gap”, “Single Plane” or “RPM” style intake manifolds allowed.

1-B Grinding, porting, polishing, gasket matching, etc., is not allowed.

8. Ignition

1-A Distributors must be stock production only. No super coils or magnetos allowed.

9. Fuel Pump

1-A Fuel pump must mount in original position. If electric pump, it must have an on/off valve located within reach of driver and safety crew and clearly marked “Fuel On/Off”.

10. Fuel

1-A Pump, E85, and race fuel only. No additives of any kind allowed. No alcohol.

11. Fuel Cell

1-A Gas tanks shall be removed and replaced with an approved racing fuel cell with a maximum of 22 gallons in the trunk area. Cell must be mounted between the frame rails. Cell may not extend more than 2” below frame rails.

1-B Fuel cell must be mounted with a minimum of two (2) 1/8” x 1” iron straps. Must have a securely fastened cap. Caps must have a small chain/cable or similar way to have cap connected to the car in case the cap comes off the tank. Cells must be vented to the underside of the car in case of roll over.

1-C A fire shield of no less that 18-gauge metal between driver/passenger compartment and fuel cell. Must have an “L” shaped shield in front and bottom of fuel cell.

1-D Fuel cell must be protected with one (1) bar in front and behind the cell not to exceed 2” in diameter. Any car leaking or spilling fuel will be black flagged and not allowed to return to the track until fixed.

 

J. Suspension/Frame Components

1, Shocks

1-A One shock in stock location per wheel. Remote shocks allowed. Racing shocks are allowed. No adjustable or reservoir shocks allowed. No air or coil over shocks allowed.

2. Suspension/Steering

1-A No weight jacks allowed.

1-B Suspension must remain stock. Must remain in stock location. Notching or altering to frame for any reason is prohibited.

1-C Steering box must be stock and in stock location. Must be GM to GM, etc.

1-D Lower A-Arms and mounting brackets must be in stock location. No adjustable upper control arms allowed. Tubed upper A-Arms are allowed. Aftermarket tubular control arms are allowed.

1-E Springs must be stock-type and in stock location.

3. Radiator

1-A Radiator must be in front of the engine and in stock location.

1-B No anti-freeze allowed.

1-C Water wetter and water allowed.

1-D Radiator mounts and supports must remain behind the bumpers.

4. Transmission

1-A Automatic transmissions with working torque converters. If a transmission cooler is used and located inside the car, it must be shielded from driver/passenger.

1-B No bump start or pump valve allowed.

1-C Manual transmissions allowed. Must be OEM type with stock clutch. No racing clutches allowed.

1-D All gears must be in working order. Both forward and reverse gears.

1-E No aluminum or any other light weight flywheels allowed.

1-F Manual transmissions must use approved scatter shields.

1-G All cars must be self starting and able to move freely on its own to start each race. Cars requiring assistance will start at the back of the field line up at any time before or during any race.

5. Driveline

1-A Driveline must be painted white with the car number painted on it.

1-B Steel drivelines only.

1-C Driveline loop or chair are mandatory. Must be placed 6” minimum and 16” maximum from the transmission tail shaft.

6 Battery

1-A Battery must be the maintenance free type, no vent caps. Sealed battery is recommended.

1-B All batteries must be mounted in an approved manner, in front of the fuel cell.

1-C No batteries shall be mounted in the passenger compartment.

1-D Batteries that are not sealed must be sealed in a marine-type box.

1-E A battery disconnect switch must be installed and clearly marked “Battery On/Off”, and must be easily reachable by driver and safety crew.

7. Rear-Ends

1-A Only stock passenger car rear-ends allowed.

1-B No 3/4 ton or 1-Ton rear-ends are allowed.

1-C Locked/welded rear-ends are allowed. Spooled rear-ends allowed.

1-D Ford 9” rear-ends are allowed if mounted in stock location.

1-E Floater rear-ends are preferred. Non-floater rear-ends are allowed.

8. Bumpers

1-A Fabricated bumpers are allowed and must pass safety tech. Aluminum is preferred. No over-built bumpers are allowed, i.e. battering rams.

1-B No black pipe.

1-C No part of the bumper may exceed the width of the car. Bumpers must remain in the stock location.

1-D No sharp edges. No blunt ends. Bumper ends must be rounded inward to the body or have straps from bumper to body which is preferred. If your bumper causes flat tires, it will not be allowed.

1-E Either two (2) safety chains or cables securely attached to or surrounding bumper to prevent it from falling off and being ran over.

1-F Front and rear bumpers must have a chain loop or hook secure enough to tow the car off the track.

9. Tires

1-A Maximum tire tread of 8”.

1-B No mud or snow or studded tires.

1-C No grooving or sipping allowed.

1-D Race tires or other DOT tires allowed.

10. Wheels

1-A Wheels to be a minimum of 3/16” centers.

1-B Wheel width maximum of 8-1/2”.

1-C Wheel studs minimum of 5/8” and 5/8” nuts. (1” nuts are preferred.

1-D Right rear wheel bead lock is allowed.

11. Brakes

1-A Brakes shall be stock. Must have at least three (3) working brakes.

1-B No copper or plastic lines.

12. Exhaust/Mufflers

1-A Stock exhaust manifolds or bottom dump headers allowed.

1-B Muffler pipe no larger than 2-1/2” diameter.

1-C Mufflers are mandatory.

1-D Exhaust must extend beyond the drivers’ compartment.

1-E Exhaust and mufflers must remain intact or car shall be black flagged.