NEVADA SPEEDWAY

Page 7 B-Mod Rules

2013 B-Mod Rules

 

      NO SPOILERS ALLOWED ON B-MODS

FRAMES - Factory production complete full American passenger frames only. Frame rails must extend to a point beyond the base of driver's seat. Rear clip may be fabricated out of tubing. Front and rear pick-up loop required; otherwise bumpers or other pick-up point will be used.

BODIES - Same as A-mod bodies. Exceptions: no spoilers, no spoiler sides, Rear Sail Panels: Must extend from the roof to the rear of the car & be the same on both sides.4 inch  max. at rear, gradual slope from roof to this point.. Sail must be flush at the rear deck

WHEEL BASE- 108 inches minimum, 112 inches maximum both sides.  NO TOLERANCE.

ROLL CAGE - Must consist of continuous hoops not less than one and one-half inches outside diameter and must have a wall thickness of at least .095 inch. Must be frame mounted in at least six (6) places. Body mounted roll cages not acceptable. Must consist of configuration of front and rear hoops connected by tubing on sides or side hoops in a manner deemed acceptable by the inspector. Driver's head must not protrude above cage with helmet on while strapped in driver's seat. Roll cage must have a 3/16-inch inspection hole in non-critical area. Must have at least three (3) horizontal bars at driver's door welded to front and rear of roll cage members.

WEIGHT - Minimum weight is 2500 pounds with driver after race.  No tolerance. Weights must not be used above deck, in driver's compartment, or outside body lines.  All lead weight must be mounted securely, with 2 weight clamps & two 1/2 inch bolts. Lead must be painted white & have your car number on the lead.

WHEELS - Wheel width must not exceed eight (8) inches. No aluminum wheels. Bead locks allowed on   RIGHT    SIDE    only. Wheel discs (Mud Plugs) allowed but must be bolted or welded or foam type. No ZUS fasteners.

TIRES - American Racer G-60 (KK704) (stamped or unstamped)modified tires. Maximum tire width of nine (9) inches mounted on a conventional one-piece steel wheel with a maximum width of eight (8) inches. Tires maybe re-grooved and sipped.

DIFFERENTIAL/REAR END - Any passenger car type or truck rear end may be used. No aluminum. No quick-change devices allowed. Floater rear ends are allowed.

BRAKES - Disc or drum brakes may be used front and rear. No aluminum disc or brake calipers allowed. Brakes must be operational on all four (4) wheels and must lock up all four wheels during inspection.

FUEL SYSTEMS - Gasoline only. No oxygen bearing additives. No pressurized fuel systems. Fuel cells mandatory. Fuel cells must be encased in an approved metal container. Fuel cells must be mounted between frame rails as far forward as possible and using two, two (2) inch by 1/8 inch metal straps Bumper must be equipped with a drag loop extending below bottom of the cell. Fuel cells must not extend below the rear end housing. 32 gal. maximum. No electric or belt driven fuel pumps.

BUMPERS - Bumpers must be used front and rear. Front bumper must be mounted on frame end and be of a semicircle configuration with the bottom loop parallel to the ground. Front bumper must be ten (10) inches high from bottom bar to top of top bar. Material must be one and one-quarter inch minimum, two-inch maximum O.D. steel pipe. Rear bumpers may be constructed of pipe, square tubing, but must not have sharp edges. Rear bumpers and nerf bars must not extend beyond width of rear tire. Bumpers must be able to support car when lifted by wrecker.

SEAT AND SEAT BELTS - Racing seat mandatory. All cars must be equipped with an approved quick release type seat belt and shoulder harness securely fastened to frame and roll cage. Seat belt material should be at least three (3) inches wide AND CANNOT BE OLDER THAN 2 YEARS. Seat and steering wheel may be located to suit driver's taste, but must be kept on left side of car. No center steer.  No fiberglass seats allowed.

Engine options:

ENGINE - Must use OEM cast iron, American make V-8 engines only. All engines must be able to be used in conventional passenger car without alterations.  Must have stock stroke crankshaft and stock length rods for the cubic inch engine that is used NO EXCEPTIONS.  (ex.  350ci gm must have 3.480 stroke and 5.7 rods).  External engine casting and threaded holes cannot be altered. No aluminum, titanium or carbon fiber components allowed.  Maximum cubic inch limits: GM 361 c.i., Ford 360 c.i., Chrysler 370 c.i., no tolerance. No 400 or larger cubic inch parts allowed.  No aluminum valve train parts allowed.  Engine must appear stock.  Only stock appearing crank and rods allowed. No H Beam Rods .No knifing or profiling of crankshafts. No lightening of any kind to crankshaft. No aluminum / lightened or light weight engine parts allowed. minimum 1-inch plug above the oil level in the side of the oil pan mandatory.  If you do not have a inspection plug the oil pan will have to be removed at time of inspection .Plug must be put in a manner were crank shaft & rods can be seen for proper tech inspection by official or pan will have to be removed for inspection.

GENERAL MOTORS:  Must be 3.48-inch stroke and 4.060-inch maximum bore.  COMPONENT GUIDELINES: Must use one of following blocks, 3892657, 3914678, 3932388, 3932386, 3956618, 3970000, 3970006, 3970010, 3970014, 10066033, 10066036, 14010207, 14010209, 14010287, 14016376, 14016379.

ENGINE LOCATION - Rear of engine (bell housing flange) must be at least 72 inches forward from the centerline of the rear axle. The center of the crankshaft must be within two and one-half (2 1/2) inches of centerline of the ball joints.

HEADS- CAST IRON AFTERMARKET HEADS ALLOWED. NO ALUMINUM HEADS ALLOWED. 200CC MAXIMUM AND 64CC CHAMBERS MINIMUM. NO VORTECH HEADS ALLOWED.

-GENERAL MOTORS:-MAY USE ANY STOCK OEM PRODUCTION HEADS. DOUBLE HUMP OR POWER PACK ALLOWED.  FLAT MILLING ALLOWED. NO ANGLE MILLING ALLOWED. PORTING OR POLISHING IS NOT ALLOWED. DART SPEC HEADS: 10320010 OR 10311112. THE WORLD PRODUCT HEADS: 011250 OR 012150.  MAXIMUM 2.02 INCH INTAKE VALVES AND 1.60 INCH EXHAUST VALVES. 3/8 STUDS MAY BE PINNED OR USE SCREW IN TYPE.  POLY LOCKS ALLOWED.  STEEL ROLLER TIPPED ROCKERS ONLY.  NO ROLLER ROCKERS.  GASKET MATCHING ALLOWED TO FELPRO 1207 GASKET OR EQUIVALENT  ONLY NO FURTHER THAN 1 INCH INTO THE HEADS. GASKET MATCHING ALSO ALLOWED ON INTAKE BUT NO FURTHER THAN 1 INCH INTO INTAKE. FLATTOP OR DISHED PISTONS ONLY. MUST USE FLAT TAPPET CAM AND LIFTERS. NO MUSHROOM LIFTERS. CANNOT ALTER LIFTER BORES. MAY USE OIL RESTRICTORS. SPRING SIZE:  1.437 AND NOT ANY LARGER. ANY LENGTH PUSH RODS ALLOWED.

-FORD: STOCK CAST IRON BLOCKS 260, 289, 302 OR 351. MAXIMUM 360 CUBIC INCHES. ANY FORD CAST IRON OEM PRODUCTION CYLINDER HEAD WITH IN LINE VALVES (NO CANTED VALVES) AND WITH VALVES NO LARGER THAN 2.02 INCH INTAKE 1.60 INCH EXHAUST MAXIMUM.HEAD NUMBER FORD WORLD PRODUCTS 53040, DART 13311112. NO SVO HEADS OR BLOCKS. FLAT TOP OR DISHED PISTONS ONLY. (TWO VAVLE RELIEFS ALLOWED). NO PORTING, POLISHING, OR ALTERATIONS TO HEADS OF ANY KIND. FLAT MILLING ALLOWED. GUIDE PLATES, SCREW IN STUDS (0.375 INCH MAX.) AND POLY LOCKS ALLOWED. NO STUD GIRDLES. STAMPED STEEL, OEM STYLE, OR STAMPED STEEL ROLLER TIP STUD MOUNTED (0.375 INCH MAX.) ROCKER ARMS ONLY. ANY LENGTH PUSH RODS ALLOWED. OEM DIAMETER SPRINGS MUST MATCH HEADS. THESE HEADS ARE ALLOWED: 053040 OR E351.

-CHRYSLER/DODGE: STOCK CAST IRON BLOCKS 318, 340 OR 360. MAXIMUM 370 CUBIC INCHES. FLAT TOP OR DISHED PISTONS ONLY.HEAD NUMBER RACING HEAD SERVICE 20300,20301.ANY OEM FACTORY PRODUCTION CHRYSLER HEADS ALLOWED WITH INLINE VALVES (NO CANTED VALVES) NO LARGER THAN 2.04 INCH INTAKE AND 1.70 INCH EXHAUST. NO PORTING, POLISHING, OR ALTERATIONS TO HEADS OF ANY KIND. FLAT MILLING ALLOWED. NO W-2 OR AFTERMARKET HEADS ALLOWED. CHRYSLER MAY USE OEM ALUMINUMN ROCKER ARM BARS. OEM DIAMETER SPRINGS MUST MATCH HEADS. ANY LENGTH PUSH RODS ALLOWED.

TRACK HAS OPTION TO ENFORCE THESE RESTRICTIONS WITH A CUBIC INCH PUMP GAUGE OR BY VISIBLY CHECKING PARTS AND PART NUMBERS. DISQUALIFICATION AND LOSS OF POINTS IF FOUND ILLEGAL.

SHOCKS: One steel, nonadjustable, unaltered shock per wheel only. All shock mounts, including screw jack type, must be welded. No external or internal bumpers or stops. No coil over, air, or remote reservoir shocks. No Schrader valves or bladder type valve allowed. Front half of any shock may be shielded. 

*FRONT SUSPENSION-FRONT SUSPENSION MUST MATCH FRAME AND BE IN STOCK LOCATION. PARTS MUST BE REPLACEABLE FROM STOCK OEM TYPE PARTS FROM SAME TYPE SUSPENSION EXCEPT UPPER A-FRAME AND A-FRAME MOUNT. TUBE TYPE UPPER A-FRAME MAY BE USED. FABRICATED A-FRAME MOUNT MAY BE USED BUT MUST BE IN STOCK LOCATION. LOWER AFTERMARKET A-FRAME CAN BE USED BUT MUST BE IN STOCK LOCATION. NO FABRICATED SPINDLES. ADJUSTABLE STRUT BARS CAN BE USED ON FRONT END ONLY. NO COIL OVER SHOCKS ALLOWED EITHER FRONT OR REAR. ONE SHOCK PER WHEEL.YOU MAY NOT RUN A DAMPENING SHOCK ABOVE THE REAREND. STEERING BOX MUST BE STOCK OEM TYPE AND BE IN STOCK LOCATION. NO RACK AND PINION STEERING. NO CENTER STEERING. ADJUSTABLE SWAY BARS ALLOWED.

*REAR SUSPENSION-TWO OPTIONS: AFTERMARKET THREE LINK DESIGN OR MULTI-LEAF SPRING DESIGN. ALL COMPONENTS MUST BE STEEL. ALL MOUNTS AND BRACKETS MUST BE WELDED OR BOLTED SOLID.YOU MAY NOT RUN A DAMPENING SHOCK ABOVE THE REAREND.

A). THREE LINK DESIGN REQUIREMENTS: MUST USE MINIMUM 16 INCH CENTER TO CENTER OF HEIMS.  NO SWING ARMS.SOLID PULLBARS ARE REQUIRED ,NO SPRING BARS, RUBBER BUSHINGS OR ANY TYPE OF TORQUE DEVISE.PULLBAR MUST BE MOUNTED SOLID ( NO RUBBER OR ANY TYPE OF CUSHION IN THE MOUNTING BRACKET) MUST BE LOCATED AT TOP CENTER OF REAR END HOUSING AND REMAIN CENTERED ON HOUSING OVER DRIVE SHAFT(1INCH TOLERENCE LEFT TO RIGHT).MAY USE MINIMUM 23 INCH LONG PANHARD BAR LOCATED BEHIND REAR END HOUSING OR MINIMUM 19 INCH LONG J-BAR MOUNTED TO A STEEL PINION BRACKET. MEASUREMENTS ARE FROM CENTER OF HEIM JOINT TO CENTER OF HEIM JOINT. MAY MOUNT REAR SPRING DIRECTLY OVER AXLE HOUSING OR USE COIL OVER ELIMINATORS (SLIDERS). LOWER SPRING PERCH OR COIL COVER MOUNT MUST BE WELDED TO REAR END HOUSING. NO BIRDCAGES OR FLOATING MOUNTS ALLOWED. MUST USE STEEL UPPER WEIGHT JACK IF SPRING ARE MOUNTED OVER AXLE HOUSING. NO SHOCK TYPE ELIMINATORS.

B). MULTI-LEAF SPRING DESIGN REQUIREMENTS: LEAF SPRING MUST USE STEEL MULTI-LEAF SPRINGS WITH NO ADDITIONAL SUSPENSION COMPONENTS BESIDES ONE SHOCK PER WHEEL. ADJUSTABLE ALUMINUM LOWERING BLOCKS ALLOWED. NO COIL SPRINGS CAN BE USED WITH LS.NO ALTERING OF LEAFS OF ANY KIND,NO TAPING, NO CUTTING, NO GREASING.

REAR END - Any steel approved OEM passenger car or truck non-cambered rear end allowed, must be centered in chassis.  Floater allowed. No quick-change devices. Inspection hole in housing required. Mini-spools only. Ring gear, center section and yoke cannot be lightened. Solid steel axles and one piece drive flanges only.

CARBURETOR/INTAKE FOR AFTER MARKET HEADS ONLY:

Eldebrock Victor Junior 2901 intake.  Stock Holley 4412 500 CFM carburetor only. No Modifications. No adjustable metering blocks. Choke horn must be intact. May remove choke butterfly. Or use Eldebrock Performer  4 bbl. intake manifold.  GM 2101, Ford 2121, Chrysler 2176 ONLY.  No Performer RPM or air gap manifolds.  Must use Mr. Gasket part No. 1933, Moroso part. No. 64966, Speedway part no. 910-11510, or HVH part. No. 4412-2 carburetor adaptor.

CARBURETOR/INTAKE FOR OEM HEADS ONLY

Must use Holley 3310 750cfm vacuum secondary single metering block butterfly can be removed.  Choke horn must be intact.  Must use Eldebrock Performer  (GM number 2101 Ford Number 2121 or Chrysler number 2176) dual plane intake.

OIL PANS - Extra capacity oil pans are permitted. No dry sumps allowed.Oil pump must mount in stock position.

STARTER - Engine must have working starter and must be capable of starting car on demand mini starters are allowed.

TRANSMISSION/DRIVE SHAFT: All forward and reverse gears must be operational, plus a neutral position. With engine running and car in still position, driver must be able to engage car in gear and move forward, then backward.  OEM production transmissions allowed. aftermarket transmission can be ran  MUST HAVE 50# OF LEAD IN FRONT OF MOTOR PLATE  25# ON EACH SIDE CAR MUST WEIGHT 2550 AT END OF RACE WITH DRIVER. No ˜in and out" boxes or quick-change devices allowed. Functioning shift levers must be in OEM location. One steel or aluminum OEM style/size flywheel or steel OEM style/size flexplate allowed, must be bolted directly to end of crankshaft.

A.) Automatic: Must be unaltered, two or three speed, OEM production case with a functioning stock appearing pump. Must have an approved scatter shield constructed of .125-inch by three-inch steel, 270 degrees around top of flex plate.Splined drive flange coupler with internal pressure relief device, gate valve, or torque converter (10-inch min) only. Hydraulic lines may not extend in to cockpit .

B.) Manual: Must be unaltered, two, three or four speed in OEM production case. No five (or more) speeds allowed.Must have working clutch inside explosion-proof steel bell housing with one hole for throw out bearing lever or hose, must be 270 degrees around top of clutch and flywheel area.MINI-CLUTCH ALLOWED.Components must rotate, consistent with engine rpm, while car is in any gear.No Bert, Brinn, or Falcon type transmissions allowed.

DRIVE SHAFT: Minimum two-inch diameter, white, steel drive shaft. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least .25-inch by two-inch steel, or one-inch tubing, mounted six inches back from front U-joint.

BATTERY - All batteries must be mounted in a safe manner.

HELMETS & FIRE SUITS - Helmets are required and must be worn at all times car is on the track. All drivers must wear fire suits of a flame-retardant nature. Two-piece suits are allowed. Fire resistant gloves are mandatory. Fire resistant boots are highly recommended..

EXHAUST - Any collector type header allowed. Exhaust must be directed away from areas of possible fuel spillage. No zoomies.

KILL SWITCH, FIRE EXTINGUISHER, WINDOW NET - A kill switch is required within easy reach of the driver. This switch must be clearly marked OFF and ON. Weights and/or loose objects are not allowed in the driver's compartment.All cars must be equipped with quick release type window net on driver's door. No rear view mirrors of any kind. No radio communication or sound equipment of any kind.

GAUGES/ELECTRONICS - 12-volt ignition system only. HEI distributor only. OEM firing order cannot be changed. Ignition rotor, cap, coil and module must remain OEM appearing. No ignition boxes, remote coil or accessories.  All wiring must be visible for inspection. Only gauges allowed are analog oil pressure and water temperature and analog tachometer (memory recall allowed). Fuel pressure gauge is also allowed.  No electronic traction control ALLOWED

 

 B-Mod Revisions:

1. If Using A GM Crate Motor #88958602 - You Are Allowed To Use A Bert,Brinn or Falcon Transmission

2.Aluminum Roller Rockers Are Allowed   - gurtle bars ok

3.No Spoilers Allowed

 

 

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