Nevada Speedway 2008 Modified Rules $30 Driver Registration Fee Before Racing 1. FRAME: OEM complete. 1964 or newer, perimeter American rear wheel drive passenger car frame only. No sports car frames. Frame must be full and complete, cannot be widened or narrowed, and must be able to support roll cage on both sides, except: weight jack in original center line of spring tower allowed; frame may be cut a maximum 36" forward from center of rear end housing. Horns may be removed in front of steering box. Front cross member may be notched and boxed for radiator and/or steering clearance. Maximum seven inch wide opening in side of spring tower for spring removal.Maximum two-inch wide by four inch tall frame stiffener may be welded directly to outside of left side frame rail. Minimum wheelbase 108 inches. Maximum 112 inches both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire to outside of tire. No part of frame can be lower than four inches from ground except front cross member. 2. ROLL CAGE: Must consist of continuous hoops. Minimum 1.75 inch O.D. tubing with a minimum wall thickness of .095 for main cage. Frame mounted in at least six places (low carbon or mild steel recommended). Must consist of a configuration of front, rear and top hoops connected by tubing on sides or side hoops. Driver's head must not protrude outside cage with helmet on. Roll cage must be securely supported and braced with minimum one cross bar in top halo. Foot protection bar required.Main cage no further forward than rear of engine. All bars forward of cage must be lower than hood. 3. BODIES: (a)1970 or newer American compact passenger car only, no panel cars or station wagons. Stock appearing front windshield and rear window support unit, painted roll bars not acceptable substitute. May utilize a flat half-windshield, with no wings, mounted to the roll cage. Must have a minimum of three windshield bars in front of driver. (b) Firewall and floorboards are mandatory. All body parts should be recognizable as factory production vehicle. Fiberglass or metal duplicates of body parts are permitted. Homemade body parts may be constructed of steel, aluminum or fiberglass. All cars in competition must have a complete paint job. No plastic body parts allowed. Body must be the same width, front to rear, and parallel to the frame. (c)Original roof line of vehicle must closely be maintained. Must be full size roof. No wings or any other ground effects are allowed anywhere outside or inside car. Sail panels must closely resemble examples shown on body diagram and be the same on both sidesof car. Any reinforcing lips on rear of sail panel must be 180 degree bends. (d) all cars must be numbered with large legible numbers on both sides, on top and rear panel. Numbers on sides and top of car must be in contrasting color from body, be at least four inches thick and at least 20 inches high. (e) Sponsor's names must not interfere with car numbers and must be neatly lettered. (f)Engine compartment will remain open, no side panels; hood sides may have maximum four inch drop and must be enclosed at rear of hood; maximum hood scoop height-six inches. Passenger side of body must be no further forward than rear of block. Rear of bodies to be solid panel at least eight inches high and include car number. No panel in front of right door to engine compartment. No inner panels. No car covers. (g) Driver and passenger side windows must have at least 12-inch opening, measured at center of window, whether the roof or roll cage, and the highest point at the bottom of window, whether the interior or body. 8" Spoiler Max. 18" side braces. 4. FRONT SUSPENSION: All components must be steel, unaltered OEM, in OEM location, and replaceable by OEM parts, except tube-type upper A-frames with aluminum/steel cross shaft, and mounts can be moved. OEM replacement lower A frames. offset, welded or bolted shock mount on lower A-frame. Lower A-frame mounts and bolt holes on frame must be in OEM location. Lower A arm tubular allowed only if stamped UMP and Fit Jig of original stock lower control arm. 5. STEERING:All Components must be steel, unaltered OEM, in OEM location, except outer tie rod end and adjustment sleeve may be replaced by a minimum .625 inch steel rod end and steel tube; spindles can be ground for brake caliper clearance only. Unaltered OEM replacement Pinto spindles, raised cast, spindles must be right and left and of same design. Bolt on spindle savers allowed.Steel steering shafts and knuckles only. Steering quickener, steering wheel and quick release may be aluminum. Cockpit steering may be modified, must be kept on left side. No rack and pinion. 6. SHOCKS: One steel, non-adjustable, unaltered shock per wheel. One additional shock allowed on rear suspension. No threaded body, front coil-over, air, or remote reservoir shocks. No Schradervalves. 7. SPRINGS: Steel only. One coil and/or leaf spring per wheel only. One additional spring allowed on pull bar or lift bar, may be progressive.Any coil spring. No torsion bars or air bags. 8. REAR SUSPENSION: All components must be steel. No covers allowed. All trailing arms/link bars must be solid tubing. Rear of frame may be altered to accept leaf or coil springs. Steel coil-over eliminators or steel/aluminum coil-over kits allowed. Must conform to shock and spring rules. One mechanical traction bar (pull or lift, not both). 9. REAR END: Any steel approved OEM passenger car or truck rear end allowed. Safety hubs (floater) allowed. All components must be steel except lowering blocks, cap and drive flange. Full steel spool, steel mini spool or welded rear ends only. Steel axles only. One piece drive flange only. No torque dividing differentials. No scalloped ring gears. Quick changes allowed. 10. BUMPERS/RUB RAILS: Steel only. Bumpers must be used both front and rear at all times and welded, or mounted with bolts. Must be minimum 1.25 inch O.D. tubing. .065 wall thickness on front. .095 wall thickness on rear. Two-bar front bumpers must be mounted frame-end to frame-end no wider than width of material outside frame horns and with bottom loop parallel to ground. Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center. Rear bumper and nerf bars can be no wider than tires. 11. TIRES AND WHEELS: American Racer Only. May be grooved, 8" steel wheels. Beadlock on right side front and rear allowed. 12. BRAKES: Must be steel approved OEM, operative four wheel, drum or disc. Must maintain minimum OEM dimensions for hubs/rotors and calipers, cannot be lightened. Bolt pattern maybe changed. Larger studs allowed. Rear rotors may be aftermarket, minimum 0.810 inch thickness. Vented rotors only. No scalloped rotors. No brake shut-off or pressure sensitive devices. One proportioning device allowed, front to rear only. Brake lines must be visible. 13. EXHAUST: Round tube headers only. All primary header tubes must enter directly into one collector at same point at end of header and point rearward. 14. FUEL SYSTEM: Racing fuel cell required, maximum 32 gallon capacity, must be in minimum 18 gage steel container. Cell must be securely mounted behind rear axle, between tires, minimum of four inches ahead of bumper, minimum of ten inches above ground. Must mount with minimum two .125 inch thick solid steel straps, two inches wide around entire cell. All cell mounts must be steel, securely welded to frame/cage. Protective tubing must cover rear and extend past both sides of cell. No part of cell shall be lower than protective tubing. Fuel cell vents, including cap, must have check valves. Pick-up must be on top or right side of cell. Limit one fuel filter. No cool caps. No top flow air cleaner housings. One naturally aspirated 2 or 4 barrel carburetor only. No adjustable carb spacers. 15. FUEL: Gasoline or alcohol. No performance enhancing additives. Upper cylinder lube allowed. Fuel sample may be take from any car at any time. 16. BATTERY/STARTER: One battery only. Must be shielded and securely mounted between frame rails. Must have capability of starting without being pushed or pulled. Must leave initial staging area on demand, unaided or go to rear of that race. 17. GUAGES/ELECTRONICS: No transmitting or listening devices, timing retard control. No electronic monitoring computer devices capable of storing or transmitting information except analog tach. No adjustable ignition control boxes. Only one 12 volt ignition box allowed, must be out of driver's reach. No additional ignition accessories allowed. Only change allowed to ignition box is one high-end rev-limiter setting. This setting can be changed through one chip only, or an internal setting inside box. No electronic traction control devices. 18. TRANSMISSION/DRIVE SHAFT: Must have at least one gear forward and one reverse, plus a neutral position. With motor running and car in still position, driver must be able to engage car in gear and move forward, then backward. Layne,Ernie Glide, Bert adn Brimm transmissions will be allowed as well as any OEM transmission. No five speed transmissions, "in or out" boxes, or quick change devices allowed. Functioning shift levers must be in stock location on manufactured after 1995. All manual gear-type transmission must have a working disc-type or approved cone-type clutch inside and explosion proof steel bellhousing. Automatic transmissions must remain in OEM stock appearing automatic case. Original bellhousing must remain. Must have an approved scatter shield or blanket. Scattershield may be constructed of 25-inch by three-inch steel, 270 degrees around flexplate or flywheel. 19. ENGINE COMPARTMENT: Rear of engine (bellhousing flange) must be mounted at least 72 inches forward from centerline of rear axle. Engine offset must be kept within 2 inches of centerline of front crossmember with engine level. Minimum 11 inch engine height from ground to center of crankshaft. radiator must be mounted in front of engine. Cooling system may be modified. 20. ENGINE SPECIFICATIONS: Any American make engine allowed. Steel heads, block and oil pan only. All engines must be able to be used in conventional passenger car without alteration. Engine mounts cannot be removed or altered. Castings and fittings must not be changed. No machine work on outside of engine. "Wet" oiling system only. Aluminum heads allowed with 50 lbs. weight. 25 lbs. on each side added in front of bellhousing. 23 Degree heads only. 21. LOOSE OBJECTS: And/or weights must not be used in driver's compartment or outside of the body or hood area. Any weights added to other areas of vehicles must be securely mounted and must be painted white and have the car number on it, and attached with at least two .5 inch bolts. 22. ASPIRATION: One two-barrel or one four-barrel carburetor OK. Must be naturally aspirated. No fuel injection. No electric fuel pumps. 23. WEIGHT RULE: 2,400 lbs with driver after race.