Pahrump Valley Speedway
Hobby Stock 2017
OEM = Original equipment manufacturer
SAFETY EQUIPMENT: Roll bar padding required in driver compartment. Recommended: Fire retardant padding. SFI-approved full fire suit required. Fire retardant gloves and Neck brace. Bump and spin gets sent to back of the pack. Second (2nd) time intentional bump and spin in the same race gets black-flagged. Driver receiving black flag two (2) RACES in a row will receive one (1) race suspension.
1. Collapsible steering shaft Driver-side window net required, minimum 16 inch by 20-inch ribbon or mesh style, and must be mounted to roll cage so latch is at top front of window. Minimum three inch (two inch with head restraint system) wide SFI-approved five point safety belt assembly required, must be mounted securely to main roll cage. Recommended: Safety belts no more than 4 years old Kill switch required within easy reach of driver and must be clearly marked ‘OFF’ and ‘ON’.
Any American OEM full body rear wheel drive passenger car, 1955 to 1985, full frame or unbody. Frame must match body. Minimum 105. inch wheelbase, maximum one inch difference from side to side. Rear of frame behind rear tires, no further forward than one inch behind factory seam, may be replaced in OEM location with two inch by three inch steel tubing with minimum 0.095 inch wall thickness, same length as material removed. Factory seam must remain visible. Unibodies must tie rear frame to front frame. Frames may be “X” braced. NO station wagons.
Main cage must consist of continuous hoops, minimum 1.75 inch O.D. tubing, with wall thickness of at least 0.095 inch. Recommended: low carbon or mild steel. Four-post roll cage required, front down bars and rear hoop must be welded to OEM frame. Driver’s head must not protrude outside cage with helmet on. Rear hoop may have “X” brace, consisting of one full horizontal and one full diagonal bar, minimum 1.25 inch O.D. with 0.083 inch wall thickness. Front down bars must be tied together, passenger side front down bars must be maximum 11 inches in from top of door. Must be minimum 40 inches between outside edge of front and rear down bars at top of door panel. Maximum 41 inches from top center of windshield to front edge of rear hoop; maximum 13 inches to front edge of top halo. Top halo must be minimum 40 inches across, outside to outside. Rear hoop may be maximum 12 inches in from bottom of opera window. May have maximum two horizontal bars, (in addition to bar tying front frame horns together) for radiator protection; must be behind bumper, within confines of body, no wider than OEM frame horns. Rear kickers (down bars) and engine hoop required, and must be minimum 1.25 inch O.D. tubing with 0.083 inch wall thickness. Fuel cell protection required, must be mounted frame rail to frame rail, no higher than fuel cell, inside trunk area with maximum 1.75 inch O.D. tubing. All bars must be inside body.
All door bars and uprights must be minimum 1.75 inch O.D. with 0.095 inch wall thickness. Minimum three door bars, both sides, parallel to ground, and perpendicular to driver. Minimum four uprights tied from frame to top door bar on driver side, and minimum three uprights on passenger side. bars on driver’s side. Plate must cover area from top door bar to rocker panel and from rear down post to five inches in front of seat. Must be visible for inspection.
All bodies must be unaltered OEM, or OEM replacement, in OEM location and match frame. Front body mounts must be visible. Sunroofs and T-tops must be enclosed. Aftermarket plastic nosepiece and tailpiece allowed,
recommended to match body. Ok spoilers No hood scoops, ground effects or skirting altering OEM appearance allowed. OEM STEEL hood only, hood may be gutted Air cleaner must be below hood opening. OEM STEEL trunk lid only, gutting ok. Hood and trunk must be securely fastened and back of hood must be sealed off from driver compartment with metal. Hood must be separate from fenders. Front inner wheel wells may be removed, rear wheel wells may be removed to middle seam. Trunk floor directly over rear end housing may be removed. Trunk floor may be removed or replaced, frame rail to frame rail, with 0.049 inch thick steel, must be located on top of frame rail. Overlapping of body panels permitted. All glass must be removed, all windows in body must remain open; maximum seven inch metal sun visor allowed across top of windshield opening. All doors must be securely fastened. Fenders and quarter panels may be trimmed for tire clearance, ONLY. No reflective body panels. Car number must be minimum four inches thick and 20 inches tall and clearly visible, on both sides and roof of car.
Minimum three windshield bars in front of driver. Aluminum high-back seat only and must be bolted in using minimum 0.375 inch bolts. Driver seat may be no further back than rear edge of B-pillar. Driver must be sealed off from track, driveline, engine and fuel cell.
Dash must be flat, rear can be no higher than front, except for cowl in front of driver. No other interior tin or covers. Inside rear quarter panels, below window level, may be cut out.
Doors may be gutted. Cutting out of firewalls ok NO, roof, kick panels, rocker panels, except for roll cage clearance. All holes in firewalls and floor must be covered with metal. OEM floor may be replaced from OEM front firewall to OEM rear firewall using steel fabricated floor pan, 18 gauge or minimum 0.049 inch thickness, securely welded to frame. Must remain flat, OEM appearing from frame rail to frame rail, no higher or lower than frame rail. Exception is maximum eight inch tall driveshaft tunnel similar to OEM tunnel in size. Rear firewall and speaker deck must be metal and be of OEM design for that make and model.
All components and mounts must be steel, unaltered OEM, in OEM location and match frame. OEM rubber A-frame bushings only. OEM or OEM replacement ball joints allowed. No rebuildable ball joints. No sway bars, spring spacers, chains or cables. OEM upper A-frame may be replaced using aftermarket upper A-frame (steel or aluminum cross shaft allowed) bolt on spindle savers allowed. Upper A-frame mount must remain OEM and cannot be moved.
All components must be steel unaltered OEM, in OEM location and match frame. OEM steering column may be replaced with steel steering shafts Recommended: collapsible steering shaft Steel knuckles only. No steering quickeners (minimum 2.5 turns lock to lock), or remote power steering reservoirs. Steering wheel and quick release (required) may be aluminum.
One unaltered steel, nonadjustable, OEM-mount shock, in OEM location, per wheel. All shocks must completely collapse at any time. No external or internal bumpers or stops No bulb-type, threaded body, coil-over, air, or remote reservoir shocks. Maximum 2.125 inch O.D. shock body. No gas port, Schrader or bladder type valve allowed. No coil-over eliminators. Rear OEM shock location is 4.5 inches from bottom of housing to center of bolt hole, and centered on control arm bracket.
One steel spring per wheel only in OEM location. Minimum 4.5 inches O.D., maximum 14 inch free height, non-progressive coil springs only No spring rubbers allowed May use up to 3.inch lowering blocks from spring to rear end.
All components and mounts must be steel, unaltered OEM
Or OEM replacement in OEM location and match frame. OEM rubber control arm bushings only. Center of
Rear lower control arm bolt hole must be 2.25 to 2.5 inches from bottom of housing. No independent rear suspension. No sway bars, panhard bars, spring spacers, extensions, chains or cables. No suspension stops of any kind allowed
No floater rear ends. OEM, or OEM replacement (recommended) solid steel axles only. Nine inch Ford rear end allowed, but must be mounted like OEM rear end (centered) for that make and model. One inch inspection hole in housing required. Ring gear, center section and yoke cannot be lightened. Steel or aluminum U-joint caps allowed. Must be welded spider gears, or mini spool. No torque dividing mini spools or differentials.
Maximum one inch wide by two inch tall steel or lexan rub rails allowed - bolted flush to body. Front and rear tow hooks mandatory. No sharp edges allowed on bumpers, rub rails or bolts. No bars past outside edge of body other than rub rails. All front bumpers must be mounted minimum six inches from front frame horns. Steel bumper mounts only. One of two bumper options must be used and must be OEM height: OEM: Bumpers not covered by plastic nose or tail piece must be complete, unaltered OEM Front bumper fender to fender rear bumper maybe Aftermarket: Fabricated tubular bumpers fender to fender. Tubular (front and rear) allowed, but must be covered by plastic nose or tail piece and bent to fit with rounded ends. Main bumper bar must be minimum 1.5 inch O.D. (maximum two inch) with 0.083 inch (maximum 0.125 inch) wall thickness.
Unaltered OEM 205/75, or 205/70, 15 inch passenger car tires only. All four tires and wheels must be same size series and offset. Tires must be inside body. No racing, or snow, or all-terrain tires. No softening, conditioning, Siping/grinding or grooving. Maximum seven inch wide, Maximum four inch offset, unaltered, D.O.T.-stamped steel or magnesium wheels with standard bead bump - must weigh minimum 19 pounds. One inch wheel spacers OK on both sides. One inch O.D. steel lug nuts required. No bleeder valves.
Operative four wheel, disc (front) and drum (rear) brakes, must match frame or rear end. OEM appearing master cylinder must be in OEM location. No antilock brake systems. No aftermarket brake pedal assemblies, brake shut-off or bias adjuster. Steel brake lines only, must be visible. No oil bath front hubs. Hubs/rotors, axle flanges and drums may be changed to different bolt pattern and larger studs.
OEM cast iron exhaust manifolds only. No center dump type manifolds. Exhaust manifold can be ported and drilled to fit. No adaptor allowed between manifold and head. Exhaust must extend past firewall and turn toward ground. Must remain dual exhaust, no crossover or ‘Y’ pipes. (2) No exhaust sensors or wrap.
Racing fuel cell required, maximum 22 gallon capacity Recommended:12 gallon must be in minimum 20 gauge steel container. Must be securely fastened in trunk above level of OEM trunk floor, behind rear tires, no further forward than factory seam where rear frame rail can be replaced, with solid steel strap around entire cell or bolted place. No fuel cells allowed over rear end housing. Metal firewall must be between driver and fuel cell. All cell mounts must be steel, securely welded to frame/cage. No
adjustable fuel cell mounts. 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. Fuel lines through driver compartment must run through metal pipe or metal conduit. No cool cans. Air cleaner top/stud cannot direct air into carburetor. No top flow air cleaner housings, cold air boxes or air cleaner ductwork. Mechanical OEM type push rod fuel pumps or one Electric pump only. No fuel pressure regulators. Must use unaltered OEM two barrel carburetor for that engine OR Rochester two barrel carburetor 500 CFM.
Gasoline only. No Racing fuel allowed. No E85. 91 Octane. No performance enhancing or scented additives. Fuel must pass both dielectric meter and chemical tests.
No ballast allowed. Any item deemed as ballast will be required to be replaced - i.e. fuel cell straps, fuel cell cans, battery boxes, etc. No titanium, magnesium or carbon fiber products. No gun-drilled, tubular, hollow bolts or studs. Steel fasteners only.
One 12 volt passenger car battery only, must be securely mounted between and above frame rails, and Battery must be in Steel OR Marine type case if mounted in driver compartment. Starter must bolt in OEM location. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race.
No electronic monitoring computer devices capable of storing or transmitting information except memory recall analog tach. 12 volt ignition system and OEM HEI distributor only. Ford/Chrysler may use HEI distributor. No billet distributors or crank triggers. Ignition rotor, cap, coil and module must remain OEM-appearing.
22.TRANSMISSION/DRIVE SHAFT: OEM = Original equipment manufacturer.
All forward and reverse gears must be operational. Manual:
Must be unaltered 100% OEM three or four speed, with minimum 10.5 inch steel/organic single disc-type clutch and steel pressure plate assembly inside an explosion-proof steel bell housing - minimum 270 degrees around top of clutch and flywheel area. No lightweight bell housings. Hydraulic clutch release bearing allowed. Steel unaltered flywheel only - 16 pound minimum $150 fine if illegal Automatic: Must be unaltered OEM, with unaltered OEM pump, original bell housing diameter torque converter stock only. - $150 fine if illegal. Torque converter must have a minimum 0.125 inch plug. Must have approved scatter shield constructed of minimum 0.125 inch by three inch steel, 270 degrees around flex plate. Flex plate must be full, unaltered OEM, or OEM replacement. No bump starts allowed. Drive shaft: Steel drive shaft (minimum 2.5 inch diameter) and slip-yokes only. Drive shaft must be painted white. 360-degree driveshaft loop required and must be constructed of minimum 0.25 inch by two inch solid steel, or one inch tubing, mounted six inches back from front U-joint.
Engine must be in OEM location. On GM metric frame, center of fuel pump must be located minimum 1.75 inches in front of cross member (measured at frame). Ford metric frames must have back of fuel pump in front of cross member. Frame and cross member may not be altered for engine placement. Engine mount holes cannot be removed or altered on block. Aftermarket steel engine mounts allowed NO tubing or tie down. No mid-plate allowed. Engine must be OEM appearing, must be able to be used in conventional passenger car without alteration. GM with GM, Ford with Ford, Chrysler with Chrysler. Minimum two-core radiator, must be mounted in front of engine. Overflow tubes must be directed to ground. Steel or aluminum V-belt pulleys only. No electric fans.
24. ENGINE BLOCK: PAHRUMP VALLEY SPEEDWAY APPROVED ENGINE BLOCK.
OEM steel passenger car vehicle production block only. No GM Bowtie, Ford SVO or Chrysler W components allowed.
GM approved block numbers are: 10105123, 10066034, 3892657, 3914660, 3914678, 3932388, 3932386, 3956618, 3970000, 3970006, 3970010, 3970014, 10066033, 10066036, 10243880,
14010207, 14010209, 14010287, 14016376, 14016379, 10054727, 14088528, 14088548, 14088552, 14093638, 14101148. Stroke must match block. No 400 or larger parts allowed.
Maximum 361 cubic inches (GM); 363 (Ford); 370 (Chrysler). Violation of cubic inch limit must be verified by removal of head and will result in disqualification, loss of all
points for the season, $500,00 fine and a 30-day suspension. Maximum compression ratio is nine to one, no tolerance. Compression ratio checked using Whistler and cubic inches checked
using pump, OR by visual inspection of part and/or casting numbers, pistons, etc (track option which method is used). Flat top or dish pistons only, no gas ported pistons. OEM or OEM
appearing replacement steel crankshaft only – cannot be lightened. No aerowing, bullnose, knife edge, undercut or drilling of second or third rod throws. OEM or OEM appearing replacement
steel rods only – GM 5.7 inch, 6 inch or GM Vortec rod part number 10108688 allowed. Cap screw allowed. No splayed main caps. Conventional flat tappet cam and lifters only, cannot alter
lifter bores. OEM firing order cannot be changed (GM: 1-8-4-3-6-5-7-2). May use oil restrictors. ‘Wet’ sump oiling system only. Steel oil pans only. Racing oil pans allowed.
no obstructions to crank and rods. Accumulator allowed, must be mounted under hood.
CYLINDER HEADS: PAHRUMP VALLEY SPEEDWAY APPROVED CYLINDER HEADS STEEL ONLY.
Must be unaltered approved
OEM and minimum 76 cc combustion chamber (GM). Only GM OEM approved head numbers are: 14079267, 3986336, 3986339, 3986339X, 3986388, 3932441, 376445, 3928454,
3932454, 3876487, 3973487, 3973487X, 3973493, 3951598, 468642, 330862, 333882, 3998920, 3998991, 3998993, 3998997, 3970126. Maximum size valves on these heads are 2.02
inch intake and 1.60 inch exhaust. May use Stock Replacement (SR) cylinder heads: Engine Quest (EQ) GM part number CH350I, (EQ) Chrysler part number CH318B, World Products
Ford part number 53030 - 1.250 inch (± .015 tolerance) maximum O.D. valve springs. All SR heads must remain as produced, seat angles and valve sizes can not be changed: three angle
valve job only (absolutely no casting removal in valve pocket of EQ or World Products head, for any reason); Ford - no SVO heads; Chrysler - no W-2 heads, 360 cubic inch heads only. No
porting, polishing or unapproved alterations allowed to any cylinder head or intake, disqualification and $250 fine if illegal. Guide plates, screw-in shouldered studs (GM 0.375 inch max)
and polylocks allowed. No stud girdles. Steel roller tip rocker arms allowed. GM - 1.250 inch (± .015 tolerance) maximum O.D. valve spring, no beehive valve springs allowed.
Unaltered, approved OEM cast iron, low-rise intake. Only unaltered (no porting or polishing) aftermarket aluminum intakes allowed are: Weiand GM #7547, #7547-1; Ford #7515,
#8023 or #7516; Chrysler #7545, #8022; Edelbrock GM #2701; Ford #7121, #7181, #7183; Chrysler #2915. Unaltered OEM type harmonic balancer only. OEM type steel or aluminum water