12.2 FRAME
12.2.1 1964 or newer OEM 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, exceptions are: Weight-jack in original centerline of spring tower allowed; Frame may be cut a maximum 36 inches 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; A maximum of 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.
Any OEM replacement clip must fit the Series templates and minimum car weight will be 2550 with 25lbs added to clip per side forward of motorplate/firewall. Must be securely fastened with thru-bolt and oversized washers for safety. Template availability will be through the Series or approved chassis manufacturers. All OEM replacement clip cars must be submitted to tech at least one hour prior to scheduled start of days event. Template doesn’t fit, you don’t race. No exceptions. The Series reserves the right to adjust weight on OEM replacement clip cars as necessary to ensure competitiveness.

                                     OPTION #3
For the Hermiston Speedway events, the NW Modified car configuration is legal per the rules used at Stateline Speedway, exception is the 8 inch wheel and the Hoosier 970 tire.
12.2.2 Minimum wheelbase, 108 inches, both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire to outside of tire. Series will allow car to be checked compressed on springs. Front tire width will be measured at the top of the tire sidewall with driver in car. (78 1/16 of an inch, will NOT race.)

12.3.1 Must consist of continuous hoops, minimum 1.75 inch O.D. tubing, with minimum wall thickness of 0.095 inch 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.
12.3.2 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.
12.3.3 Foot protection bar required.
12.3.4 Main cage no further forward than rear of engine.


12.4.1 All driver side door bars and uprights must be minimum 1.5 inch O.D. with 0.083 (0.095 recommended) inch wall thickness. Minimum three driver side door bars, parallel to ground and perpendicular to driver, and welded to front and rear of roll cage.


12.4.2 Passenger side must have at least one cross door bar, horizontal or angled, minimum 1.25 inch O.D. with 0.083 (0.095 recommended) inch wall thickness, and one top door bar, minimum 1.5 inch O.D. with 0.083 (0.095 recommended) inch wall thickness.
12.4.3 Steel door plate, 18 gauge or 0.049 (0.125 recommended) inch minimum thickness, must be securely welded to outside of driver side door bars and cover area from top door bar to bottom door bar and from rear hoop down-post to five inches in front of seat. Must be visible for inspection.

12.5 BODY (Modified style bodies approved)  
TAR and 5 star Bodies are allowed

12.5.1 Materials optional…no carbon fiber or Kevlar

12.5.2 Body must be same width, front to rear, and parallel to OEM/ OEM Replacement frame. Tech discretion in play. Nose panel may be no wider or lower than two inches outside of the front frame horns. Nose panel must remain within the confines of the front bumper. Cooling holes allowed.
12.5.3 Engine compartment must remain open (no side panels). Hood must be enclosed at rear. No panel in front of right door to engine compartment. No inner panels.


12.5.4 Must have front windshield and rear window support posts. Driver and passenger side windows must have at least 12 inch opening (height and width), measured at center of window, between lowest points at top of window, whether roof or roll cage, and highest point at bottom of window, whether interior or body. May use Lexan in sail panels. May use full windshield.
12.5.5 Roof shall be rounded down in all directions. Maximum 1.5 inch rolled down rock guard allowed on roof front.
12.5.6 Maximum four inch plastic skirting allowed on bottom of doors and quarters.
12.5. Rear Spoiler/Allowed 4” tall, top 3” clear plastic cannot be wider than rear body. 240 square inches max. 3 inches tall spoilers can be over 60 inches wide, but not wider than the rear body or over 240 sq. inches. We do not want any end cap support going forward. You can have a support in the center going forward, but it must be 12 inches from the end cap and cannot be longer than 10 inches and must taper down from the top of the spoiler to zero.


12.6.1 Must have minimum three windshield bars in front of driver. Lexan or aluminum cowl panel in front of driver can be no wider than cockpit and no farther back than steering wheel.

12.6.2 Minimum 0.125 inch aluminum, or 0.060 inch steel, complete floor pan required.
12.6.3 Aluminum high-back seat only and must be bolted in, using minimum 0.375-inch bolts, next to left side frame rail and ahead of rear tires. Bottom of seat can be no lower than bottom of frame rail. Modern containment seats highly recommended.
12.6.4 Driver must be sealed off from track, driveline, engine, fuel cell, canisters and pumps. Oil coolers must not protrude above interior. Accumulators cannot be mounted between driver and left-side door bars. No driver-adjustable devices allowed while car is in competition except brake adjuster. Mirrors approved.


 Front suspension must be unaltered approved OEM and be in stock location, and must be replaceable by stock parts. Tie rod ends and adjustment sleeve may be replaced by a minimum 0.625- inch rod end and steel tube. (Heim joints allowed) Weight jack must be in original center line of spring. Stock passenger car spindles only; no fabricated spindles. Spindles can be ground for brake caliper clearance only. Bottom A-frames cannot be altered or moved (exception: can weld shock mount on A frame; After market ball joints are allowed). No offset or bearing type lower control arm bushings. Tube type upper A-frames allowed and can be moved. Front sway bar can be an aftermarket type. Chain on one side is allowed.
SPINDLES (Royal Purple Modified Series Approved Spindles ONLY)  Stock passenger car spindles. NO!! Fabricated Spindles. NO!! Dropped Spindles. Reaming of upper and lower taper to accept larger ball joints is allowed. NO!! steering  arm modification, [ Heat and Bending or changing hole location ] You can drill out or tap steering arm to accept minimum 5/8 Diameter bolt for tie rod.
Aftermarket safety hubs will be allowed from 2018 on with tech approval.


12.8.1 No rack and pinion. All components must be steel, unaltered OEM, in OEM location, exceptions are: Outer tie rod end and adjustment sleeve may be replaced by a minimum 0.625 inch steel rod end and steel tube; Steel steering shafts and knuckles only; driver compartment steering may be modified, must be kept on left side.

 12.8.1. Quick release required, steering quickener and steering wheel may be aluminum. Idler arm, pitman arm, and center link must match frame.


12.9.1 Shocks: Only shocks allowed are one steel, nonadjustable, unaltered shock per wheel. No threaded body shocks, front or rear, or air type, or remote reservoir shocks. Schrader valves allowed. Shocks cannot be mounted in center of spring. External shock dampening adjustment of any kind is not allowed. The only legal gas port is a Schrader valve style. Gas plugs that do not allow the shock to be de-gassed without removal of the plug, and gas ports that utilize needle filling systems, are not allowed. Internal, stationary base valves, meant to reduce gas pre---load, are not allowed. No compressed air style bump stops allowed.


12.10.1 One steel, non-progressive, coil spring per wheel only. Steel or composite leaf spring allowed. One additional spring allowed on pull bar or lift bar, may be progressive. Any coil spring must be at least 4.5 inches O.D. No torsion bars, air bags or inner liners.


12.11.1 No independent 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.  

12.11.2 Steel coil-over eliminators, or steel or aluminum coil-over kits allowed - must conform to shock and spring rules. Only one mechanical traction bar (pull or lift, not both) allowed. Rubber bumpers allowed only on pan hard bar and mechanical traction bar. Coil-over shocks allowed on rear suspension


 12.12 REAR END

12.12.1 Quick change Rears allowed, Safety hubs (floater) allowed. An inspection hole is required in housing. Steel/iron carrier housings only. Pinion bearing support housing may be aluminum.

12.12.2 Full steel spool, steel mini spool or welded rear ends only. Only steel axles allowed. 

12.12.3 One piece drive flange only. No torque dividing differentials or scalloped ring gears allowed.
12.12.4 No traction devices of any kind allowed. No devices allowed that would enable driver adjustment to alter wheelbase or for weight jacking while car is in competition. No air shocks or air bags allowed.

12.13 BUMPERS  

12.13.1 Steel bumpers must be on front and rear at all times and welded or mounted with minimum .375 inch bolts.

12.13.2 Rear bumper must be constructed of solid-square or minimum 1.25 inch O.D. tubing with 0.095 wall thickness, no wider than five inches outside of rear frame rails. If wider than five inches outside rear frame rails, must be capped and bent forward 90 degrees, or constructed in a loop design.


12.13.3 Must have at least one upright, minimum 1.25 inch with 0.065 wall thickness, from bumper to fuel cell guard.
12.13.4 Two-bar front bumper must be minimum 1.25 inch O.D. tubing with minimum 0.065 wall thickness (maximum 0.095 inch ) 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. No rounded bumpers

12.14.1 Must use Series Tire, Hoosier 970. No soaking or altering of tire rubber compound in any way.

12.14.3 All wheels must be maximum 8"
12.14.4 Rim-mounted bleeder valves allowed.
12.14.5 Must use only steel studs, must protrude through lug nuts.

12.15 BRAKES

12.15.1 Calipers are not a tech item. Rotors must be OEM type and non-lightened. Tech approval.

12.15.2 Bolt pattern may be changed. Larger studs allowed.
12.15.3 Rear rotors may be aftermarket 0.81 inch thickness (new). Vented rotors only
12.15.4 No brake shut-off or pressure sensitive devices. One front to rear proportioning device allowed. Brake lines must be visible. Brakes must be operational on all four wheels and must lock up all four wheels during inspection.


Round tube headers only. All primary header tubes must enter directly into one collector at same point at end of header. Mufflers must be used, spec muffler(s) may be required. All exhaust must go through muffler(s). Merge collectors allowed. No side exits allowed. All exits must turn down.


12.17.1 Mechanical or belt driven fuel pump only and must be mounted at front of engine.

12.17.2 Racing fuel cell required, maximum 32-gallon capacity, must be in minimum 20 gauge steel container.

12.17.3 Cell must be securely mounted behind rear axle, between rear tires, minimum of four inches ahead of bumper. Must mount with minimum two solid steel straps around entire cell, two inches wide and 0.125 inch thick. 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. Tech approval.
12.17.4 Fuel cell vents, including cap vent, must have check valves. If fuel cell does not have aircraft style positive seal filler neck/cap system - a flapper, spring or ball type filler rollover valve is required.

12.17.5 Pick-up must be on top or right side of cell.

12.17.6 One naturally aspirated four-barrel carburetor only.

 12.18 FUEL

12.18.1 Gasoline or alcohol. Racing fuel allowed. No performance-enhancing additives. Upper cylinder lube is only allowed with alcohol fuel. Alcohol cars must notify tech. Sunoco is preferred vendor.

12.19 WEIGHT

12.19.1 No weights and/or loose objects in driver compartment, above interior deck or outside body.
12.19.2 Minimum total weight for all cars, other than noted below, is 2500 lbs , 58% left side weight. pre-event, with driver in the seat.
A.OEM Replacement Clip cars 2550 minimum, see rule 12.2 Option #2.

B.Cars running a Sealed 602 crate engine minimum weight is 2400 lbs. and 58.5% left side. We reserve the right to change this rule as the need arises. 602 Crate engine must meet the 2018 Rocky Mountain Raceways rulebook, any teched motor found illegal will be confiscated, and owner will be banned from participating for 1 year. No exceptions


12.19.3 ALUMINUM CYLINDER HEADS: Aluminum cylinder Heads allowed with 25 pounds added to each frame rail at the dog-leg (BOTH SIDES) total weight (You no longer need to add 50 pounds to your total weight. )

12.19.4 Maximum left side weight percentage is 58.0% as weighed pre event, with driver and helmet in the seat. Exception - 58.5% 602 Crate motor option.


12.20 Battery(s) must be securely mounted between frame rails, and positive terminal must be covered.

12.20.2 Car must have capability of starting without being pushed or pulled.


12.21.1 No transmitting or listening devices, timing retard controls, or digital gauges (including tach).
12.21.2 No electronic monitoring computer devices capable of storing or transmitting information except analog tach.

12.21.3 No adjustable ignition control boxes. 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.

12.21.3 No magnetos or electronic traction control devices allowed.

 12.22.1 Must have at least two forward gears and one reverse, plus a neutral position. With engine running and car in still position, must be able to engage car in gear and move forward, then backward.

12.22.2 Transmission optional. Must have a forward and a reverse gear operational.

12.22.4 Flexplates must be full, steel, unaltered OEM, or OEM replacement. Flywheel/flexplate must bolt to engine between clutch assembly and crankshaft and all driveline components within bellhousing must rotate while car is in any gear.

12.22.5 Transmission must be one of the following designs: Manuals: Explosion-proof steel bell housing is mandatory where tech deems necessary. One flywheel only, minimum 8.5 inch diameter. Diameter of clutch disc must be a minimum of 5.5 inches. Clutch assembly must be steel, except housing, which must be steel and/or aluminum, can have only a hole for throw out bearing lever or hose must be 270 degrees around top of clutch and flywheel area. Internal clutches approved. Standard or reverse mount starter allowed must directly engage flywheel. Automatic: Must remain in OEM or OEM replacement case, with a functioning OEM appearing pump. Aluminum OEM bellhousing may be replaced with aftermarket explosion-proof aluminum bellhousing. Original OEM bellhousing must have approved scatter shield constructed of minimum 0.125-inch by three-inch steel, 270 degrees around flexplate.
12.22.6 Drive Shaft: Minimum two-inch diameter steel drive shaft and must be painted white. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least 0.25 inch by two inch steel, or one inch tubing, mounted six inches back from front U-joint.


12.23.1 Rear of engine (bellhousing flange) must be mounted at least 72 inches forward from centerline of rear axle, tech approval or prior acceptance allowed. Engine offset must be kept within two inches of centerline of front crossmember with engine level.
12.23.2 Radiator must be mounted in front of engine. Cooling system may be modified. Overflow tubes must be directed to ground between frame rails.


12.24.1 Any make engine allowed. 6 cylinder allowed at 2400 lbs.


12.24.2 Cast iron block mandatory.  ALUMINUM CYLINDER HEADS: Aluminum cylinder Heads allowed with 25 pounds added to each frame rail at the dog-leg (BOTH SIDES) total weight 2,500, 58% left side weight. (You no longer need to add 50 pounds to your total weight)

12.24.3 All belt driven accessories must be on front of engine. ‘Wet’ sump oiling system only.

12.24.7 One 4 bbl carburetor required utilizing a mechanical fuel pump mounted in factory location. No fuel injection allowed without tech approval.


12.24.8 .FAST™ EZ-EFI® or FAST™ XFI Sportsman™
Part numbers for these systems have been set aside for Western Region Modified Series ( Spears, Northstate,Intermountain)

a. One FAST™ EZ-EFI® or FAST™ XFI Sportsman™ System may be used. Any engine with carburetor and electric fuel pump
MUST have in place a 10-15 lbs. oil pressure shut off switch properly wired for the electric fuel pump. FAST™ EZ-EFI® and FAST™ XFI Sportsman™ Systems are internally wired with fuel pump safety shut off.

b. FAST™ EZ-EFI® or FAST™ XFI Sportsman™ System at this time must be purchased from Arce Engines as a complete unit.
System will include throttle body, ECM, electrical harness and electric fuel pump.

c.FAST™ EZ-EFI® and FAST™ XFI Sportsman™ System ECM must be mounted in a location that allows easy access for
inspection or exchange.

d.At any time, you may be asked to exchange your FAST™ EZ-EFI® or FAST™ XFI Sportsman™ ECM.

e. At NO time shall the FAST™ EZ-EFI® or FAST™ XFI Sportsman™ System wiring harness be altered or changed in any way,
shape or form. All FAST™ EZ-EFI® or FAST™ XFI Sportsman™ ECM’s must have the Fuel Injection Racing Association (FIRA) tamper proof seal in place at all times.

f. The FAST™ EZ-EFI® and FAST™ XFI Sportsman™ Systems feature patent pending technology with the most advanced selftuning control strategy available anywhere today. Simply hook up the necessary wires, answer the basic setup Wizard questions
on the included hand-held display and the system tunes itself as you drive. Countless research and development hours were
spent on a number of prototype test vehicles to develop a high-quality system truly worthy of the FAST™ brand. Capable of supporting 600-1000 horsepower engines at 60psi, the FAST™ EZ-EFI® and FAST™ XFI Sportsman™ Tuning Fuel Injection System can be purchased as a complete system, including the ECU, wide- band oxygen sensor, wiring harness, fuel injectors, optional
fuel pump kit and other assorted components, including the innovative 4150 Throttle Body from FAST™. The FAST™ 4150
Throttle Body delivers the total package approach for anyone with an existing 4150- type intake manifold. Everything comes with the kit, including appropriate fuel injectors and fuel rails. In addition, it works with the original carb-style throttle linkage and is ready to accept all OEM sensors.

g. This FAST™ EZ-EFI® and FAST™ XFI Sportsman™ System is provided as is, without any guarantees or warranty. In association
with the product, Spears Manufacturing Modified Series or Arce Enterprises makes no warranties of any kind, either expressed or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, of title, or of noninfringement of third-party rights. Use of the product by a user is at the user’srisk.