9-1.1  This class is open to the following American-made, passenger car, production sedans: Chevrolet (Monte Carlo, Lumina); Dodge (Intrepid, Charger); Pontiac (Grand Prix); Ford (Thunderbird, Taurus and Fusion); Buick (Regal); Oldsmobile ( Cutlass).  Any body not listed here may be approved with prior written notice to LVMS.  All bodies must be neat appearing and stock as produced by manufacturer. Bodies must be constructed of steel, aluminum or fiberglass. Carbon fiber and/or kevlar components are not permitted. Flat or slab-sided bodies are not permitted.  All Bodies should comply to ABC body guidelines.

9-1.2  The nose and grille area may be cut for the installation of air ducts only. The rear bumper may not be altered, modified or drilled. Approved front air dams must have a minimum of 4 in. ground clearance. A full rear filler panel is required.

9-1.3  The roof must be located in the stock position and may not be crowned or altered in any manner. All other body parts must be securely attached without sharp edges.  No rails, fins, or spoilers permitted on rear window.

9-1.4  Belly pans are not permitted.

9-1.5  Exterior nerf bars or any other type of external supporting devices are not permitted.

9-1.6  Interior of the car must be totally isolated from engine compartment and fuel cell, with firewalls of minimum 24-gauge steel. All holes must be sealed.  Aluminum interiors are subject to weight penalty.

9-1.7  Rear spoiler height may not exceed 6.5 in., measured from any point along the deck lid to top of spoiler on all cars. Rear spoiler may be a maximum of 60 in. wide on all cars. Rear spoiler must be slotted in center to allow for template (½-in.).  Rear spoilers must be constructed of clear material (such as Lexan) for safety and visability.

9-1.8  Hood must be even with top of front fenders, and may not exceed the height of the fenders, and completely cover the air cleaner and carburetor. A rearward-opening scoop is permitted with a maximum depth of 4 in. and a maximum width of 24 in.

9-1.9  Hood must be within ¾-in. of windshield along entire cowl surface.

9-1.10 Front and rear fender flares will not exceed a 1-in. flare from outside of tire.

9-1.11  A body template will be used at LVMS officials' discretion.  All decisions of Chief Tech Inspector are final.

9-2.0  WINDOWS

9-2.1  A windshield made of clear safety glass or Lexan must be used. Minimum thickness is 1/8-in.  Windshield must be supported between the dashboard and roof halo bar with a minimum of 3 evenly- spaced metal strips, 1/8-in. x 1 in.

9-2.2  Each car must have a rear window made of clear safety glass or Lexan. Rear windows must be flat and not "dished" from roof to deck lid.

9-2.3  All side window glass must be removed. Driver's-side window net is required on all cars, and must be dated within 3 years.  Window net must have dated tag by manufacturer.  Net material must be a minimum ¾-in. wide and have openings of at least 1 in.. Net must be equipped with a quick-release device on the top-left front corner. 


9-3.1  Minimum weight of car and driver is 3,000 lbs., unless competing with an LVMS spec engine or a dry-sump system. Cars competing with the LVMS spec engine must weigh a minimum of 2,850 lbs., including driver. All other weight restrictions and/or penalties still apply (there is a 100 lb. added weight for using a dry sump systems). These weight advantages/penalties may be adjusted in the interest of fair competition at anytime. Cars must be of minimum weight prior to any event, qualifying, heats, dashes, B-Features or A-Features.  Car may be weighed after an event (only fuel is permitted to be added and the end of an event to make weight).

9-3.2  Left-side weights: 58%.

9-3.3  Minimum wheelbase permitted is 105 in.  Maximum tread width is 68 in., measured at spindle height.  Magnetic steel spacers are permitted to utilize maximum allowable tread width. Please note: LVMS will review tread width for 2010 racing season.

9-3.4  Frame rails, body and all added lead must maintain a minimum of 4 in. ground clearance. There must be a minimum of 8 in. ground clearance at the fuel cell. There must be a minimum of 3 in. ground clearance at the oil pan. All height measurements will be made with driver outside of the car.

9-3.5  Added weight must be in minimum 5 lb. blocks, must be painted white, must have car number clearly visible on each piece and may not be added to the outside of the frame rails, ahead of the front spindles, behind the rear axle and must remain within the shell of the body.  All added weight must be attached with a minimum of two ½-in. Grade-5 bolts.

9-3.6  All cars must have a minimum of 10 in. between the center of the crankshaft and the ground.


9-4.1  The purpose of the LVMS spec engine is to offer an economical alternative to competitors. The LVMS spec engine is intended only for small-block Chevrolet engines.

9-4.2  Maximum displacement is 360 cu. in., including wear.

9-4.3  Maximum compression ratio is 10.5:1.

9-4.4  Engine block must be of cast iron and must originate from a mass-produced type engine.

9-4.5  Titanium is not permitted in engine, except for the valve retainers.

9-4.6  Crankshaft must be cast or forged steel only, weighing a minimum of 50 lbs. The crankshaft may not be "knife-edged" or cut in anyway to lighten the total weight. Polishing of crankshaft is not permitted.  The stroke is limited to 3.48 in. (plus-or-minus .020). Crankshaft design and shape must match OEM.  Minimum rod journal size of 2.00 (-.030).

9-4.7  Connecting rods must be solid, magnetic steel. Aluminum, titanium, stainless steel or hollow rods are not permitted. GM connecting rods must be used with GM blocks. Interfacing of rods between manufacturers is not permitted (i.e. no Honda rods in GM engines).

9-4.8  Pistons must be of a flat-top or dished design only. A minimum of 3 rings per piston is required. The pistons may not protrude above the deck.

9-4.9  Camshaft must be a solid steel lifter type with a maximum lift of .510 in., measured at the valve. Valve lash adjustment prior to inspection is not permitted. . Hydraulic or flat-tappet lifters are permitted and must maintain original manufacturer's stock diameter. Mushroom, roller or roller-type (including ceramic roller replacements) lifters are not permitted. Camshafts must be designed to maintain contact between each lifter and each lobe at all times.  No hard-faced cams are permitted.

9-4.9b  Firing order. engine must maintain OEM firing order.

9-4.10  Independent stud, roller tip rocker arms and stud girdles are permitted. Shaft rockers are not permitted.

9-4.11  Cylinder head must be a stock Chevrolet Vortec (casting Nos. 12339906, 12558062) only. Casting number must be clearly visible and not altered in any way. Combustion chamber volume must be a minimum of 61cc.  Maximum intake port volume is 173cc and maximum exhaust port volume is 163cc.  Angle milling, port matching or grinding of any type is not permitted. The heads may be surfaced /milled only to true the gasket surface. Chemical milling or porting is not permitted. No alterations may be made to the bowl, port or runner area.  Combustion chamber volume will be tested using the LVMS Goodson CC Measuring Kit.  Windshield wiper fluid will be used in the test and the head will be tested as raced in the event (you will not be allowed to remove carbon). 

9-4.12  Maximum intake valve size is 1.94 in. and maximum exhaust valve size is 1.5 in. Valves must be steel or stainless steel only.

9-4.13  Intake manifold must be a stock Edelbrock (part No. 2912 or 2913) only.  Intake manifold may not be modified in anyway, including painting.  Carburetor spacers are prohibited between the carburetor and the intake manifold.

9-4.14  Engine rules are established based on the use of a wet sump oiling system.  Dry-sump systems or external pumps are permitted with a 100 lb. weight penalty on LVMS spec engine.  An accusump-type auxiliary oil reservoir is permitted. Oil pans must have an inspection plug with a minimum diameter of one 1 in. on the driver's side, allowing visibility of the crankshaft and connecting rods.

9-4.15  The carburetor must be a Holley 4412 (casting No. 3250).  The only modifications permitted are:
a) The choke air horn may be removed with a square-mill cut.
b) The butterflies may be drilled with one idle hole each (maximum of 3/16-in. in diameter).
c) Cam and accelerator pump may be replaced with aftermarket parts.
d) The choke and linkage may be removed, but screw holes must be filled.
e) Power valves, metering blocks and floats may be modified.
f) No device to alter air flow may be attached to carburetor air inlet.

9-4.16  The carburetor and intake manifold are subject to an exchange by the Chief Technical Inspector. The carburetor exchange consists only of the main body. If any part(s) are found to be illegal, the driver is subject to penalties, including: loss of purse, loss of points and/or suspension from future races. Exchange of carburetor and/or intake manifold will take place during post-race inspection following the main event.

9-4.17  All cars are subject to the use of a restrictor plate at the track's discretion.

9-4.18  Any car not passing the bore-and-stroke test with the LVMS P&G tester and/or the compression test with the LVMS Whistler guage will have the option for teardown to measure bore, stroke and combustion chamber volume for mathematical calculation to determine compression ratio and cubic inch displacement.  Refusal for teardown will result in automatic disqualification.


9-5.1  Cars not using the LVMS spec engine must compete with V-8, pushrod engines.

9-5.2  Maximum displacement is 360 cu. in., including wear.

9-5.3  Maximum compression ratio is 12:1.

9-5.4  Engine block must be of cast iron and maintain the factory-stock weight, design and dimensions.
No aluminum or aftermarket blocks are permitted.

9-5.5  Titanium is not permitted in the engine, except for the valve retainers.

9-5.6  Dry-sump oiling systems are permitted. Any car competing with a dry-sump system must carry an additional weight penalty of 50 lbs., making the minimum weight of car and driver 3,050 pounds.

9-5.7  Cylinder heads must be stock, cast iron production components only. The head must contain the original manufacturer's casting number and must have been used in a production vehicle. Bow-tie, Vortec and/or Camel-back heads are permitted. Ford and Chrysler heads are subject to prior approval of Chief Technical Inspector.

9-5.8  Three-angle valve jobs are permitted.

9-5.9  Heads may be resurfaced or milled on gasket surface. Heads may be port matched a maximum of ½ in. into the intake port.

9-5.10  Crankshaft must be cast or forged steel only. Aftermarket crankshafts, similar in design to OEM, are permitted. Odd firing order or 180-degree crankshafts are not permitted. Stroke must be 3.48 in. (plus-or-minus  .020).  Crankshaft must weigh a minimum of 50 lbs. Polishing of crankshaft is not permitted.

9-5.11  Connecting rods must be solid, magnetic steel. Aluminum, titanium, stainless steel or hollow rods are not permitted.

9-5.12  Camshafts: solid steel (hydraulic or flat tappet). Roller lifter cams are not permitted. Lifters must maintain stock diameter for the engine being used (no interchanging of parts). Roller tappets, mushroom valve lifters or roller type lifters are not permitted.

9-5.13  Independent stud, roller tip rocker arms, shaft rockers and stud girdles are permitted.

9-5.14  The carburetor must be a Holley 4412 (casting No. 3250).  The only modifications permitted are as follows: A) The choke air horn may be removed with a square-mill cut. B) The butterflies may be drilled with one idle hole each, maximum of 3/16-in. in diameter. C)  Cam and accelerator pump may be replaced with aftermarket parts. D) The choke and linkage may be removed, but screw hole must be filled. E) Power valves, metering blocks and floats may be modified.

9-5.15  Only aluminum or steel, single-piece intake manifolds may be used. The intake manifold must remain stock as sold by the original manufacturer, porting and/or polishing is not permitted. The intake manifold may be port matched a maximum of ½ inch into intake ports at the head.

9-5.16  A maximum 1 in. thick adapter may be used between the carburetor and intake manifold.

9-5.17  Pistons must have a minimum of 3 rings each.

9-5.18  All cars are subject to the use of a restrictor plate at the track's discretion.


9-6.1  Any dry-air filter is permitted. The element, filter assembly or the area around these items may not be sprayed or soaked with any type of chemical, liquid, gel or powder . No filter oil may be applied to any air filter element.  Air must enter the filter housing in an even and consistent manner without obstruction. LVMS reserves the right to impound all air filters at any time. LVMS reserves the right to mandate a spec air filter at any point during the racing season.

9-6.2  Air filter housing must be round.  Fabricated mass produced carbon fiber or fiberglass air box are permitted.  No home made carbon fiber or plastic air boxes permitted. No alteration of air flow in air cleaners are permitted.


9-7.1  Engines must be located so that the forward-most spark plug hole is within 2 in. of the center of the upper ball joint.

9-7.2  Crankshaft must be centered within 1 in. of the vehicle's frame rails. Minimum clearance between the center of the crankshaft and the ground must be 10 in.

9-7.3  All mounts must be securely bolted.  Adjustable mounts are not permitted.


9-8.1  Electronic distributors, single or dual breaker points or any camshaft driven type distributors are permitted. Magnetos, crank trigger, optically triggered or computerized systems are not permitted.

9-8.2  All cars must have a functional starter located near the stock location.

9-8.3  Batteries must be securely mounted within the confines of the body, but not within the driver's compartment. Batteries must be housed in electrically-insulated container.  Dry cell batteries are not required to be contained in leak-proof containers.

9-8.4  Traction control devices - mechanical, electrical or otherwise - are not permitted.

9-8.5 All ignition boxes inside driver's compartment must be of a six-pin connector configuration and
must not be within driver's reach. All ignition boxes are subject to inspection at any time.

9-8.6  Maximum of two (2) ignition boxes are permitted. Both ignition boxes must be functional and controlled by a switching device.


9-9.1  All cars must have a fan guard in place. Fan shrouds or ducts directing air to the radiator are permitted between the frame rails.

9-9.2  Electric fans are permitted, but must be mounted on the back side of the radiator only.

9-9.3  Radiators must be stock appearing and remain in the stock location.

9-9.4  Anti-freeze is not permitted for use in the cooling system.

9-9.5  A minimum 1 gal. overflow catch tank is required in all cars. Catch tank may be located in the engine compartment with a protruding hose which enables driver to view overflow.

9-9.6  Water pump must be mechanically driven, must be located in the stock location and must rotate in the same direction as the crankshaft. All coolant must flow in the same direction as the OEM production engine.


9-10.1  The use of any exhaust manifold is permitted.

9-10.2  Exhaust pipes from header to the collector may not be larger than 5-in. in diameter (O.D.).and may not extend past body.


9-11.1  Any aftermarket or OEM manual or automatic transmission may be used. Transmissions with enclosed clutches are permitted. Transmission must have a functional forward gear and reverse gear.

9-11.2  Minimum diameter of clutch plates and discs must be 5 1/2 in.  The pressure plates and discs must be made of magnetic steel only. Aftermarket scatter shields are recommended.

9-11.3  Flywheel must be constructed of steel.

9-11.4  Driveshafts must be made of magnetic steel and painted white.

9-11.5  Quick-change rear ends are permitted. Cambered rear ends are not permitted. Direct drive cars are not permitted.  Cars must be self-starting with working clutch.

9-12.0  FRAMES

*9-12.1  Full tube frames or stock sub-frames are permitted.  Perimeter style chassis only. 

9-12.2  Main frame rails must be constructed of rectangular tubing having a minimum outside circumference of 10 in. and a minimum thickness of .083 in.

9-12.3  Clearly marked tow hooks must be located in both the front and rear of the car for hook-up.

9-12.4  The driver's side door must have at least 3 complete horizontal bars between the pillars and 2 vertical bars extending from the window opening to the frame rails.

9-12.5  Roll cage must be welded to main frame rails in a minimum of 6 locations.


9-13.1  Independent rear suspension is not permitted. Independent front suspension is required. Bump stops permitted. 
9-13.2  Minimum coil spring diameter is 2 ½ in. Bottom coil spring mounts must be located on the lower A-arm and top mount must be securely attached to the chassis. Lower A-arms must be made of magnetic steel.

9-13.3  The rear springs must be mounted in the same manner on each end of the rear end housing (both in or both out).

9-13.4  All upper A-arms must be made of magnetic steel. Aluminum cross shafts are permitted.

9-13.5  Shock absorbers may not have external reservoirs. Only one shock per wheel is permitted.  Penske 7300 series, Carrera Magnum and Ohlins WCJ series shocks are not permitted. No base valve shocks.

9-13.6  Static weight-jacking devices are permitted. No weight may be moved while car is in motion.


9-14.1  NASCAR-approved quick-release steering wheels are required. All steering wheels must have a minimum 2-in. thick pad in the center.

9-14.2  Steering columns must be collapsible (U-joints are acceptable).

9-15.0  BRAKES

9-15.1  Four-wheel disc brakes with magnetic steel, non-coated rotors are required.

9-15.2  Brake bias valves are permitted.

9-15.3  Aftermarket calipers are permitted.

9-15.4  Brakes must be functional at each wheel during competition.


9-16.1  Track-specified fuel is required for competition. The chemical composition of the fuel may not be altered by any means. Fuel may not be cooled by any means prior to entering the carburetor.

9-16.2  All cars must be equipped with an approved fuel cell, securely mounted in the trunk area as far forward as possible.

9-16.3  Fuel cell must be mounted with steel framework (1 in. x 1 in., .065 in. minimum) and attached with a minimum of four (4) ½-in. bolts to the frame rails.

9-16.4  Glass fuel filters, electric fuel pumps and belt-driven fuel pumps are not permitted. Fuel lines may not enter driver's compartment. Fuel may not be cooled in any way from fuel cell to carburetor.

9-16.5  Fuel must be purchased from the LVMS-authorized distributor.  Any competitor competing with a fuel product not authorized by LVMS will be considered in violation.


9-17.1  Magnetic steel, 15 in. x 10 in. racing wheels are required. Minimum offset allowed is 3 in. Maximum offset allowed is 5-1/2 in.  .

9-17.2  Only one (1) valve stem per wheel. Bleeders are not permitted.

9-17.3  Track-specified tire (Hoosier 970) is mandatory.  All tires must be purchased from LVMS and branded. Visiting cars may be eligible for a one-race grace period based on the decision of Chief Technical Inspector. Soaking, softening or otherwise altering the composition of tires is not permitted.

9-17.5  Tires must be branded prior to the drivers' meeting.

9-17.6  Competitors must start the feature event on the same tires used during qualifying.