Rules for OEM Street Class

Purpose:

To establish a class using small (10.5” wide) tires which allows an economical yet very competitive level of drag racing.  Rule structure is intended to ensure fair and open competition for all American car makes while maintaining costs.  Class rules allow one small power adder coupled with a limited cylinder head and OEM block ensuring parts breakage is minimized.  This in turn will ensure car counts are greater and more consistent.  Also this class will allow track managers/promoters to plan definitively ensuring events stay on schedule and are entertaining for the spectators.
 

Engine Sizes/Weight Breaks:

Big Block – 416 cubic inches in displacement (cid) minimum and 480 cid maximum, 3500 lbs minimum car and driver weight.  Engines larger than 480 cid will not be allowed to compete.

Any OEM carburetor or similar to Holley 850 CFM (cubic feet per minute) carburetor.  Holley: Maximum venturi diameter: 1.5625”.  Must be a 4150 series Holley; no Dominators, sleeved King Demons or Predator carburetors allowed.

Small Block – 367 cid minimum and 415 cid maximum, 3100 lbs minimum car and driver.  Any OEM carburetor or similar to Holley 750 CFM rated carburetor.  Holley: Maximum venturi diameter: 1.375”.  Must be a 4150 series Holley; no Dominators, sleeved King Demons or Predator carburetors allowed
 

Micro Block – No cid minimum and 366 cid maximum, 2800 lb minimum car and driver. Any OEM carburetor or similar to Holley 650 CFM rated carburetor.  Holley: Maximum venturi diameter: 1.250”.  Must be a 4150 series Holley; no Dominators, sleeved King Demons or Predator carburetors allowed.

General Rules:

●Heads up start, .500 Pro Tree. 

●Courtesy staging is in effect during eliminations. 

●No deep staging.

●Each event will include two (2) rounds of qualifying.  Each contestant is required to make at least one round of qualifying.  Quickest 8 cars from that qualifying event will compete.  Contestant cannot use a qualifying pass from a previous event to make the field.

●Competition ladder will be determined by random drawing.

●Any American produced passenger car or pickup (hereafter referred to as car) of any year. 

●Factory installed frame rails required. 

●Car and driver must meet current, local track safety requirements prior to competition.  This may include IHRA and or NHRA requirements.  Contact each track prior to arrival to ensure your car will meet their specific requirements.  Chassis certification requirements are in effect.  Cars that do not meet minimum safety requirements will not be allowed to compete.

●Cars and drivers must be technically inspected and be certified to compete by race officials the day of the event.

●Car with driver must be weighed in on organizer’s scales the day of the event during tech inspection.  Car with driver must weigh-in prior to each round of competition or at the discretion of the race officials.

●Each engine will be subject to “pumping” to determine final displacement.  This will be used to determine the car’s weight break.

●OEM gasoline tanks or trunk/bed mounted fuel cells only.  Only one fuel pump allowed.  Separate fuel system for nitrous is not allowed

●Batteries can be re-located from original location.  Up to 2 trunk/bed-mounted batteries allowed. 

●OEM glass must be installed.  Light weight windows such as lexan are not allowed.

●Fenders, doors, truck lid must be OEM material.  OEM body work such as scoops, openings, spoilers and ground effects are allowed to be installed in the original location and without modification.

●Fiberglass hoods and bumpers are allowed.  Up to 4” cowl hood allowed; rear facing openings only.  Hood must be installed during competition.  Fiberglass bumpers must maintain the OEM shape.

●Gasoline fuel with a specific gravity of between .69 and .75 only; any octane.  No methanol or ethanol allowed.

●OEM transmission only.  No Lenco’s, Jerico’s or other aftermarket transmissions allowed.  Upgraded bellhousing and/or cases are allowed.  Maximum of 4 forward gears; any ratios.  No transmission brakes.

●Factory installed firewall must remain in original location and cannot be modified for engine clearance.  

●OEM style rear suspension only.  Coil over shocks are not allowed.  Example: If the OEM installed leaf springs, then car must compete with leaf springs.  Control arms can be “boxed.”

●Bolt on traction devices only such as “slapper” type traction bars and “Cal Trac” bars.  No ladder bars or aftermarket four links allowed.

●28” tall maximum x 10.5” wide maximum slicks only.  Mini tubs are allowed.  Tire size as determined/annotated by manufacturer on tire.  No “W” tires.

●Passenger front seat, OEM door panels, OEM dashpad and carpeting are required.  Rear seat optional.

●Brake system upgrades allowed.

●OEM headlights, taillights must be installed and remain functional during race event.      

●Only one power adder will be allowed.  One nitrous oxide plate system mounted under carburetor will be allowed. One “Sportsman” solenoid is allowed on the nitrous side only.  Nitrous systems must be commercially available and be installed as delivered from manufacturer.  No custom built systems, progressive timers or fogger systems are allowed.  Nitrous purge systems must be vented outside engine compartment and away from openings leading to engine compartments.  One nitrous bottle up to 15 lb capacity only.  Nitrous bottle must be mounted inside the trunk/bed – other locations not allowed.  Other power adders are not allowed.

●Single four barrel cast (iron or aluminum) intake manifold only.  Porting and polishing is allowed but no welding or epoxy.  No sheetmetal or fabricated manifolds.  Spacers allowed.

●Single four barrel carburetor (Holley or OEM - See Engine Sizes below).  Example:  If competing with a Chevrolet engine then the OEM carburetor can be the Quadra Jet (Q Jet) or Rochester 4GC.

●No electronic fuel injection allowed.

●OEM Cast Iron passenger car and truck production blocks only.  Blocks must have part numbers or casting numbers visible – no removal, grinding or altering of numbers.  Up to three lifter bushings can be installed for repair purposes only.  OEM aluminum blocks, LS1, Gen III, and Chevrolet 502 big blocks are not allowed.

●OEM Cast Iron Heads only (See list of approved head castings.)  Heads can be ported but cannot be welded or have epoxy installed.  Valve angles relative to deck must remain OEM.  Stainless steel replacement valves are allowed.  11/32” valve stem diameter minimum.  Angle milling is allowed.  Welding or epoxy repairs must be approved by rules committee prior to competition. 

●Pushrods cannot be offset and must remain in the stock location. 

●OEM rocker arm systems only.  Replacement roller tip and roller fulcrum allowed.  No shaft mounted rocker arms unless OEM equipped.  Replacement shaft rockers must use OEM mounting bosses/system.

●Flat tappet cam only.  No roller lifters allowed.  Lifters must be OEM diameter/shape (No “mushroom, Shubeck or similar type lifters allowed.) 

●Aftermarket distributors and coils are allowed.  MSD 6AL box only.  No crank triggers, programmable ignitions or MSD 7 series boxes.

●No titanium components allowed in or on engine.

●No vacuum pumps allowed.

●Any size commercially available chassis headers are allowed.  Headers may be modified with coatings, EGT bungs, O2 sensor bungs and crankcase evacuation systems only.  Custom fabricated headers are not allowed. 

●Mufflers are required.  Engine exhaust must exit through mufflers.  Tailpipes are optional.

Approved Heads:

American Motors Corporation - Any OEM Cast Iron Heads.

Buick – Any OEM Cast Iron Heads except Stage 2.

Cadillac - Any OEM Cast Iron Heads. 

Chevrolet, Big Block – OEM “Oval” Port Cast Iron head only.  No rectangle port heads, Bow Tie heads or Marine heads allowed.

Chevrolet, Small Block – OEM Cast Iron 23 degree valve angle heads only.  No Bow Tie heads allowed.

Ford, Big Block – Any OEM Cast Iron Heads.  No Cobra Jet, Super Cobra Jet, or Ford Motorsports heads.

Ford, Small Block - Any OEM Cast Iron Heads.  No Ford Motorsports or 4 barrel Cleveland heads. 

Mopar, Big Block - Any OEM Cast Iron Heads.  No “Max Wedge,” “Hemi” or any “Stage” heads. 

Mopar, Small Block – Any OEM Cast Iron Heads except W-2s. 

Oldsmobile - Any OEM Cast Iron Heads.

Pontiac – Any OEM Cast Iron “D” port head.  No “Round” port heads allowed.  No Super Duty, 455 High Output, Ram Air IV or Ram Air V heads allowed.

Dominating Performance Clause

The car and driver that wins more than three events in any single season will be considered as having dominating performance.  A weight penalty will be imposed for that car and driver.  The car with driver will be required to weigh-in at a minimum of 100 additional pounds to the weight breaks cited above.  The car with dominating performance will be required to run heavy for one year from the date of the third win.  Weight penalty will carry over to next racing season.
 

Rules Committee

Members in Good Standing

Members will be considered in good standing if annual dues are paid in full and member is not serving a penalty for rule infraction, protest dispute or for one year from refusal of claimer clause.
 

Rules Review

Rules will be reviewed at least annually or sooner at the discretion of the Rules Committee.
 

Technical Inspection

All cars, safety equipment and driver’s licenses will be subject to inspection at any time.  Be prepared to allow access to carburetor venturis, valve train, spark plugs, etc. Also engine could be “pumped” during pre race inspection to determine cubic inch displacement and thus weight breaks.  Post race inspection:  Winner and runner-up will be prepared to remove 1 spark plug, loosen valve train and cycle engine to determine engine displacement.  Failure to satisfy this requirement will result in forfeiture of winnings and points for the event. 
 

Protests

Protestant can only be a competitor from the qualified field of the event.  A $200 protest fee will be paid by the protestant.  If protested car or engine is found illegal then guilty competitor will forfeit all prize winnings for that event and the accrued points for that season.  Guilty competitor will be required to change the illegal component and demonstrate rules compliance at next event.  Protest must be filed at or before the final tech inspection or final weigh-in of the event.  If protest is proved true through inspection or admission the $200 protest fee is returned to the protestant.  If protest is found false then protested competitor receives the $200 protest fee.  Teardown is required immediately following the event.  Untimely response by protested competitor will result in assumption of guilt and resulting penalties.

Dues

Annual dues are $50 per year per car.  For a member to be in good standing dues must be received by Rules Committee at or before the first event of the year.  No refunds.   Annual dues are in addition to event entry fees.   
 

Points

One point will be awarded for each round of competition won.  Competitor with the most points at the end of the season will be crowned Champion.  Runner-up will also be recognized.  In the case of a tie, number of event wins will be factored.  Each event win is worth one point.
 

Claimer Clause

Engines, less accessories (starter, distributor, carburetor, nitrous plate, water pump, headers), can be claimed.  Claimant can only be a competitor from the top 4 of the qualified field of the event.  A $6000 claimer fee will be paid by the Claimant to the owner of the claimed engine.  If competitor with claimed engine refuses to relinquish engine then he/she will forfeit all prize winnings for that event and the accrued points for that season.  Also eligibility from competition in this class will be forfeited for one year from the date of the claim.  Claim must be filed at or before the final tech inspection or weigh-in of the event.  Claimer must provide tools, hoist, labor, equipment, drain pans, etc. for a complete removal of engine.  Untimely response by owner of claimed engine will result in stated penalties.  Rules committee is not responsible for damage suffered during claim.