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Clarke County Speedway, LLC
Osceola, Iowa

2015 Outlaw Hobby Stock Division Rules

2015 changes are bold and underlined


Clarke County Speedway, LLC
Osceola, Iowa

2015 Outlaw Hobby Stock Division Rules

2015 changes are bold and underlined


Disclaimer: Clarke County Speedway, LLC. does not imply or guarantee safety. Total responsibility of vehicle safety and rule compliance is owner/driver, not Clarke County Speedway, LLC. Officials reserve the right to alter program or purse structure in the interest of time restraints. Clarke County Speedway officials have all rights to refuse any vehicle entered into any event.

1. Safety Equipment: All vehicles require a 5 SFI point racing harness attached to the roll cage. Window net with a top release is required. Window net brackets must be connected to roll cage. All drivers must have fire suits, racing gloves, neck brace, full face helmet and racing shoes. All helmets need to be 1995 or newer Snell approved or equivalent. Head cover and nomex underwear recommended. Aluminum high back racing seat required. Seat must be mounted to cage. Quick release steering wheel recommended. Kill switch required within easy reach of driver and must be clearly marked “ON” and “OFF”. Fuel shut off recommended.

2. Frame: Any American OEM full body rear wheel drive passenger car, 1964 or newer, full frame or unibody. Minimum 107.5 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 min. 0.095, max. 0.125 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, Camaros, Firebirds, or Mustangs.

3. Roll Cage: Main cage must consist of continuous hoops, minimum 1.75 inch O.D. tubing, with wall thickness of at least 0.095 inch, low carbon or mild steel recommended. 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 must 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 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. Minimum one cross bar in top halo. 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) 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 tubing will be limited to .125 wall thickness. All bars must be inside body.

4. Door bars: 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. Steel door plates, 18 gauge or 0.049 inch minimum thickness, must be securely welded to outside of door 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.

5. Body: All bodies must be OEM, or OEM replacement, in OEM location. Front body mounts must be visible. May use newer body styles. (For example -1988 and newer Cutlass, Grand Prix, Lumina, Regal or Monte Carlo. This is the same for Ford and Dodge bodies). Body does not need to match frame. Sunroofs and T-tops must be enclosed. Aftermarket plastic nose and tail pieces allowed, recommended to match body. Spoilers, hood scoops, ground effects or body skirting are ok. OEM STEEL hood only, engine hood may be gutted. OEM STEEL trunk lids only, no gutting. 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 must be removed. 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.

6. Driver Compartment: Minimum four 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 not to extend more than 24 inches back from center of lower windshield opening except for cowl in front of driver. OEM firewall may be replaced using steel fabricated firewall to accommodate newer bodies, 18 gauge or .049 inch minimum thickness. No other interior tin or covers. Inside rear quarter panels, below window level, may be cut out. Doors may be gutted. No cutting out of firewalls, roof, floor, 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. No mirrors of any kind. Fuel line in drivers’ compartment must in a pipe or conduit and be painted red and have the word FUEL on it.

7. Front Suspension: All components and mounts must be steel, unaltered OEM, in OEM location and match frame. OEM rubber lower A-frame bushings only. No aftermarket ball joints. No sway bars, spring spacers, chains or cables. Exceptions are: for 1978-1987 GM mid-sized metric frame, OEM upper A-frame may be replaced using aftermarket upper A-frame (steel or aluminum cross shaft allowed), must display “IMCA approved” decal on top of rear tube of A-frame; bolt on spindle savers allowed. Upper A-frame mount must remain OEM and cannot be moved. No suspension stops of any kind allowed.

8. Steering: All components must be steel unaltered OEM, in OEM location and match frame.
May use replacement spindle with Speedway Motors raised cast - part numbers 91034501-L and 91034501-R; bolt on spindle savers allowed.  OEM steering column may be replaced with steel steering shafts (collapsible steering shaft recommended). Steel knuckles only. No steering quickeners or remote power steering reservoirs. Steering wheel and quick release (required) may be aluminum.

9. Shocks: 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 coil-over shocks, air shocks, remote reservoir shocks. No 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.

10. Springs: One steel spring per wheel only in OEM location. All coil springs must be minimum 4.5 inches O.D. and non-progressive. NO SPRING SPACERS ALLOWED. Spring Rubbers Allowed. Top of spring buckets may be rebuilt with a steel plate, but must be equal size (thickness) on both sides of car and must be welded in place.

11. Rear Suspension: All components and mounts must be steel, unaltered, OEM, in OEM location and match frame. OEM rubber control arm bushings only. No steel, neoprene or offset bushing allowed. Trailing arms must be OEM. No altering of trailing arms allowed. 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, chains or cables. No suspension stops of any kind allowed.

12. Rear End: Nine inch ford rear end and floater rear ends allowed, but must be mounted like OEM rear end (centered) for that make and model. One inch inspection hole in housing required. No lightened ring gears. Must be welded spider gears, or mini spool. No torque dividing differentials.

13. Bumpers / Rub Rails: Bumpers must be approved OEM or manufactured tubular in OEM location. Manufactured tubular bumpers, minimum .095 thickness are allowed. One bumper allowed on front and rear. No stacking bumpers allowed. Bumpers must be capped to fender with steel, welded or bolted. 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.

14. Tires & Wheels:  Hoosier G60-15, American Racer G60 or any sanction car passenger tire allowed. To keep the cost down we HIGHLY recommend used Hoosier or American Racer G60’s. All four tires and wheels must be same size. No snow, recaps or all-terrain tires. No softening or conditioning allowed. Tires may be ground, siped, or grooved within the tread and it may not pass the factory straight line. Bead lock allowed on right rear only. One inch O.D. steel lug nuts required. No bleeder valves. Maximum 8 inches wide steel wheel. No wheel spacers.

15. Brakes: Steel, unaltered OEM, or unaltered OEM replacement (No aluminum brake drums), operative four wheel, disc(front) and drum(rear) brakes, must match frame or rear end. Full OEM or OEM replacement backing plates, no aftermarket backing plates allowed. 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. Hubs/rotors, axle flanges and drums may be changed to different bolt pattern and larger studs.

16. Exhaust: OEM cast iron exhaust manifolds only. No center dump type manifolds. Exhaust must extend past firewall and turn towards ground. Maximum two inch O.D. exhaust pipes. Must remain dual exhaust, no crossover or ‘Y’ pipes. No exhaust sensors. Mufflers recommended.

17. Fuel System: Mechanical OEM type push rod fuel pumps only. Unaltered OEM two barrel carburetor for that engine, except: booster I.D. may be machined to 0.25 inch and venturi I.D. machined to 1.375 inch on Rochester carburetor. Must remove carburetor choke plate. No carburetor spacers on cast iron intake. One 0.25 inch (maximum) thickness gasket only on cast iron intake. Speedway Motors carburetor adaptor, part #135-3502G, allowed on GM aluminum intake. Mr. Gasket carburetor adaptor, part #1933, allowed on Ford and Chrysler aluminum intake. Maximum of two 0.100 inch thick carburetor gaskets on all aluminum intakes. Air cleaner top/stud cannot direct air into carburetor. No top flow air cleaner housings, cold air boxes or air cleaner duct work. Maximum 22 gallon racing fuel cell required and must be in a steel container with a minimum thickness of 20 gauge and maximum thickness of .125 inch. 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 minimum of two solid steel straps around entire cell, two inches wide and .125 inch thick only. 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. No vented fuel caps. Fuel cell vents 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 shut off recommended. One fuel filter only, cannot be in driver’s compartment. No cool cans.
GM CRATE ENGINE: Must use same Rochester carburetor and Speedway Motors carburetor adaptor, part #135-3502G as claim engine. Maximum of two 0.100 inch thick carburetor gaskets only.


18. Fuel: Gasoline only. Racing fuel and E-85 allowed. No performance enhancing or scented additives. Fuel must pass both dielectric meter and chemical tests.

19. Weight: Ballast is allowed and must be painted white with your car number on it.

20. Battery / Starter: One 12 volt passenger car battery only, must be securely mounted between and above frame rails, and positive terminal must be covered. Battery must be in 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. Battery disconnect switch required within reach of the driver and 12” of gear shift levers and clearly marked "OFF" and "ON".

21. Gauges / Electronics: No timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except analog tach. No ignition control boxes. 12 volt ignition system and OEM HEI distributor only. Ford/Chrysler may use HEI distributor. No billet distributors or crank triggers.  All ignition rotors, caps, coils and modules must remain OEM-appearing. No electronic traction control devices. No transmitting devises. RaceCeiver is allowed but not mandatory. Crate engine MUST use MSD #8728 rev-control and 6,200 rpm chip. Claim engine MAY use MSD #8728 rev-control with any rpm chip. Rev-control must be mounted under hood on engine firewall and accessible for inspection with rev limiter facing upward. No ignition boxes. All wiring must be visible for inspection.


22. Transmission & Drive Shaft: All forward and reverse gears must be operational. Three speeds will have three forward gears, and a four speed will have four working forward gears.
Manual: Must be unaltered 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.
Automatic: Must be unaltered OEM, with unaltered OEM pump, original bellhousing and minimum 10 inch diameter torque converter containing a minimum of three quarts of fluid. 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 flexplate. Flexplate must be full, unaltered OEM, or OEM replacement. No manual 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.
Rear chain required at rear of driveshaft.

23. Engine Compartment: 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 mid-plate allowed. Engine must be OEM appearing, must be able to be used in conventional passenger car without alteration. 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 Specifications: : All cars must clearly display on driver side front roof post which engine they are competing with. Must be contrasting in color from body, minimum 2-inches tall and display CLAIM or CRATE. Markers not acceptable
(A) CRATE ENGINE: Must use unaltered sealed GM #88958602 or #19258602 crate engine. Recommended to have IMCA Cable-Lok seals on all GM 602 Crate engines.  (IMCA Cable-Lok seals will be required in the next couple of seasons.) Upon inspection, any different, altered or missing GM seal bolts will result in disqualification, loss of all points for the season and pay for the night. More penalties may result, will be an official’s call.
(B) Claim/Open Engine: Any American make engine allowed. Steel heads, block and oil pan only. OEM passenger vehicle production block only. No GM Bowtie, Ford SVO or Chrysler W blocks. GM approved block numbers are: 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 cubic inch parts allowed.   
Maximum 361 cubic inches (GM/AMC); 364 cubic inches (Ford); 370 cubic inches (Mopar).
Maximum compression ratio is 9.0 to 1, no tolerance. Cubic inches checked using pump, OR by visual inspection, such as part/casting numbers and flat top or dish pistons (track option which method is used). Flat top or dish pistons only, no gas ported pistons.
(B.1)Cylinder Heads: Cylinder heads must be unaltered approved OEM and minimum 76 cc combustion chamber. 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 alterations of any kind to heads or intake, this will result in a disqualification if found illegal.
(B.2)Intakes: Unaltered, approved OEM cast iron, low-rise, two barrel 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. No hi-rise or marine intake manifolds. Flat tappet cam/lifters only. No mushroom lifters. Cannot alter lifter bores. Steel roller tip rocker arms allowed. No beehive valve springs allowed. Guide plates and screw-in shouldered studs (0.375 inch max) allowed. No stud girdles. Poly locks allowed. Unaltered OEM type harmonic balancer only. OEM firing order cannot be changed. OEM type steel or aluminum water pumps only. ‘Wet’ sump oiling system only. Racing oil pans allowed. One inch inspection hole suggested in all oil pans, no obstructions to crank and rods. Accumulator allowed, must be mounted under hood.

25. Numbers: Vinyl graphic or NICELY PAINTED numbers. All cars must be numbered with large, legible numbers on each side and top. Numbers must be in contrasting color from body, in all light conditions. If the scorers can’t read it you will not be scored. Driver/Sponsor lettering on other areas is permitted if it is in good taste (This is a family show). Numbers on side of car must be located on front door panel and be at least 3 inches thick and 18 inches high. Numbers on top must be at least 3 inches thick and 18 inches high. If your numbers do not meet these requirements you will be given 1 week to have it fixed prior to racing again.

Tech Inspection:
All classes may be teched weekly. If you are found illegal you will lose points and money for that night. All cars must pass a safety inspection and comply with the official’s decision on make/model, to be safe and equally competitive. Unobserved items escaping detection during inspection does not make them legal. Non-conformance to the rules will be called illegal. All permitted LEGAL exceptions to the rules will be noted by Clarke County Speedway on the entry blank.

Rules subject may change without notice

Any questions or information call 641-414-9104