Okie Bowl Hardtop Rules

Disclosure...The Okie Bowl Hardtops have been running for over 2 years now and it's time to buckle down. I'm sorry to say but No more super modifieds or sportsmens will race with us! Hard Tops and vintage Stockcars ONLY! These cars can still be built on a budget so throw one together and come out and race with
us!

NO IMCA, HOBBY STOCK, STREET STOCK CHASSIS!!!
IF YOU SHOW UP WITH A HARDTOP BUILT LIKE THIS YOU WILL NOT RACE WITH US!!!
We want to try and keep the cars period correct!

Engine

• Engine size max 360ci

• NO BIG BLOCKS!

• NO aluminum heads

• NO angle milling of heads

Body

• 1928 thru 1948 steel American-made passenger car sedan or coupe type bodies.

• Bodies must be completely stock.

• No chopping, shortening, or altering.

• All flammable material, glass, and hardware must be removed.

• All window openings must remain stock except rear window which may be enlarged a maximum of 6 inches all around opening.

• Rear of body may be shortened or bobbed to the last rear cross member.

• Doors must be welded or bolted shot.

• Stock cowl must remain on body except for trimming.

• Hood mandatory and must be stock appearing for body used.

• Hood can be aluminum, steel, or fiberglass replacement.

• Bodies will have a 60” minimum height measured from ground to top of body.

• NO portion of the body may be lower than the bottom of the frame main rails.

Weight:

• All 6-cyl. And Flathead V-8 cars will weigh a minimum of 2100 pounds.

• All overhead valve V-8 cars will weigh a minimum of 2200 pounds

Floorboards:

• Car will have complete floorboard from firewall to behind driver’s seat and from side to side of main frame rails. May be aluminum or steel.

Fenderwells:

• Front fenders and fenderwells may be removed.

• Rear fenders may be removed.

Frame:

• Stock steel frame only.

• Must have a complete X-type cross member.

• Frame may be boxed for reinforcement.

• Frame may be V’d outside of cage area.

• All cross members must be replaced with steel tubing, channel iron, or pipe.

• NO replacement tubing used in main side rails between center of front axle and center of rear axle, except when needed for mounting of nerfs, cage, body, or springs.

Roll Bars:

• 1.5” o.d. x .095 minimum steel tubing or 1.25” x .120 steel pipe full cage mandatory.

• Cage must be welded to main frame in 6 places, plus gussets must be used.

• Minimum 3 sidebars on left and 2 sidebars on right connecting to front and rear cage uprights.

• Cage must be braced to rear and cross-braced to each side.

Front axle:

• NO after market tube axles or twin I-beam axles.

• Independent front ends allowed, but must come factory..

• Front billet or safety hubs recommended.

• Stock spindles OK.

Rear End:

• Any rear end permitted except the following:

  • NO open live axles or independent rear end.

  • Rear end may be locked or unlocked.

  • Safety hubs recommended.

Suspension:

• Steel leaf springs only are allowed.

• Mounting must be transverse (cross) or parallel only.

• Adjustable shackles and weight jacks OK.

• Sway bars allowed, but must be OEM type.

• NO after-market sway bars, no torque arms, coil overs, torsion bars, spring rod and biscuit, coil over eliminator, or fifth arm suspension permitted.

Shocks:

• Steel shocks only.

• Minimum of 1 shock per wheel mounted in any position.

• Racing shocks permitted but cannot be adjustable.

• NO driver operated adjustable shocks or weight adjusting devices allowed.

Steering:

• Any truck or passenger car steering box permitted, except NO rack and pinion.

• Only OEM power steering boxes and pumps are permitted.

• Steering may be quickened or a steering quickener added.

• Steering wheel and seat may be moved to center of car.

• Racing steering wheels and quick release hubs recommended.

Brakes:

• All cars must have adequate brakes on at least 3 wheels at all times.

• Any type brake system allowed.

• Disc brake calipers must be steel.

Transmission:

• Any OEM transmission allowed.

• Must have one forward and one reverse gear in working order.

• Automatic transmissions with any converter allowed.

• NO in and out boxes or quick change boxes.

• Clutch:

  • Single disc only.

  • 10” minimum o.d. clutch pressure plate assembly.

  • No direct drive, multiple disc, dog or Ram type friction clutches allowed.

Wheels:

• Any width steel wheel allowed.

• Racing wheels are recommended.

• NO aluminum, magnesium, plastic, or carbon fiber wheels allowed.

• NO bead locks.

Tires:

• Any DOT tire with a minimum hardness of 50.

• Any recap tires on a DOT casing.

• Maximum tread width is 8” except RIGHT REAR which will have a maximum tread width of 10”.

• Tires may be grooved.

• McCreary, Hoosier, Goodyear, American Racer

• MUST have a DOT stamping and fit within tire width gauge.

• NO exceptions.

Wheelbase:

• Must be within 2” of stock wheelbase for year of body used.

• No car will be permitted with less than the minimum of 105” measured on the shortest side at any time, unless it was caused by an incident on that race date.

Fuel Tank:

• Must be located in rear area of body.

• Must be in an area sealed off from the driver.

• Must have vent valve for safety in case of rollover.

• Fuel cells must be fully enclosed in a metal box.

Fuel:

• Pump gas or racing gas ONLY.

• NO alcohol, nitro, or nitrous oxide.

Radiator:

• Any radiator may be used; overflow tank recommended.

• Must be in front of engine.

Drive shaft:

• must be painted white and have a safety strap at front of shaft.

Battery:

• Must be securely mounted and sealed (covered).

Flywheel:

• May be aluminum or lightened but must have a starter ring gear.

• ALL cars must be self-starting with starter in good working order.

Scatter shield:

• Shield must be a minimum of 3/16”x4” steel, 180 over bellhousing area, and be mounted to frame. Or use an approved scattershield bellhousing such as C.A.E., Lakewood, etc.

• Belting of not less than ¼” thick may be used.

Engine:

• Any American or Canadian OEM gas engine permitted except V-6 and overhead camshaft engines. The following limitations and rules apply:

• 6-cylinder overhead valve and Flathead (V-8 or 6-cyl) engines have no cubic inch limits or restrictions except B below.

• NO fuel injection, blowers, or superchargers on any engines.

• 8-cylinder overhead valve engine:

  • stock stroke

  • stock crankshaft

  • stock rods

  • stock bore with a maximum .060 overbore for clean up

  • steel heads with no porting or polishing

  • steel OEM block.

  • NO internal modifications

    • except

      • cam

      • oil pump

      • timing chain

      • pistons.

• Camshaft:

  • Hydraulic or flat tappet with .560 maximum lift

  • no roller cams.

• Oil pump:

  • Hi-performance replacement allowed

  • no dry sump systems.

• Timing chain:

  • Stock or true roller chain only, no gear drive or belt systems.

• Pistons:

  • Flat top only, cast or forged pistons permitted.

• Oil pan:

  • May be baffled or capacity increased.

• Manifold:

  • Any single 2 or 4 barrel, cast iron or aluminum intake allowed.

  • NO tunnel ram type manifold permitted.

Carburetor:

• Must be a Holly 2 barrel #4412 with a maximum 1” thick adapter plate.4 barrel cabs allowed up to 650cfm.

Ignition:

• Stock with internal modifications OK.

• No magnetos.

• Roller rocker arms allowed.

• Headers allowed. No 180 systems allowed.

Fuel pump:

• Any pump OK, but must be mounted in original location.

• No Vortec cylinder heads or manifolds.

Engine set back:

• All engines will be allowed no more than an 8” set back from center of front axle to front of vibration damper.

Muffler:

• All cars must run mufflers at all times and must be 95dB or less at 100’.

Nerf bars:

• Must have side nerfs on all sides of body with NO sharp or jagged edges and securely fastened.

• Front nerf should be rounded.

• Rear nerf should be wide enough to cover 75% of rear tires.

Seat:

• Aluminum seat only.

• No fiberglass or plastic seats.

• Seat mounting must have (4) 3/8” bolts minimum, 2 bolts on the bottom and 2 bolts on the seat back near top area with large washers on each.

• High back or headrest recommended.

• Second seat allowed for a passenger.

• Passenger side must have 3 door bars and a window net.

Appearance:

• Cars must be attractively painted with large numbers in contrasting color.

• Numbers must be at least 24” high on each side and deck lid of car.

• No primer painted cars permitted.

• NO radio communications to driver is allowed