2015 ABC Stock Car Rules

Written by SMS Admin.

2015 Stock Car Rules - ABC
Revision: January 4, 2015 (tires)

Springport Motor Speedway  Promoter Jeff Parish (989)395-0933

Please also read and understand the General Rules, (published separately) they apply to all classes / competitors.

The ABC Stock Car Series is designed for many different variations of stock cars which are currently racing at most local short tracks in Michigan and surrounding states. The most common classes of cars are typically known as Sportsman, Street Stock, and Pure Stock. Other names for allowable classes to compete in this series might be Pro Stock, Super Stock, Factory Stock, Lead Sled, and Bomber. This series is designed for current up to date race cars as well as what many consider to be old and outdated race cars.

The basic ABC Stock Car is V8 powered and rear wheel drive. Teching in this series is very easy since all areas of enforcement are clearly visible. Teardowns are not needed in this series. In addition to the requirement of V8 and RWD, there are some ultimate limits to what is allowed. Those limits are covered in these rules.  Even though there is a very wide range of cars allowed in the ABC Series, the basic concept allows everyone to be competitive because of the feature race format. The generic ABC name is derived from the features that will be run, A-main, B-main, and C-main. With enough cars present, there can also be a D-main, and even an E-main or more. There will always be 12-24 cars in each feature, therefore, only a total of 36 cars are needed to run three feature events on any given night. Yet the format allows for an unlimited number of cars to race since additional features can be added.  The ABC concept allows everyone to be able to compete in a feature along with other drivers and cars of similar speed. There are no consi races or semi features. Everyone qualifies for a feature, the A-main, B-main, or C-main, depending on the qualifying times. (or D-main, E-main, etc)

The most important rule is this: Any car that is deemed too radical and too much outside of the rules of typical stock car classes that can be found competing at various other area tracks will not be allowed. With that said, the rules for this series are fairly open, but will be controlled by SMS officials if necessary. Interpretation of these rules is for the SMS officials and Final decision is in the hands of the Technical Director Dan Bailey.

A) Eligible Chassis
1. Factory production uni-body cars
2. Factory stock full frame cars
3. Stock front sub frames with tubed center and rear sections
4. Full tube frames
5. Minimum wheel base is 102 inches

B) Bodies
1. The most important rule here is that bodies MUST REMAIN AS STOCK APPEARING AS POSSIBLE. This means that cars must have all body panels (hood, roof, deck lid, fenders, doors, quarter panels, nose, and tail) that would be seen on any street legal production car/truck. Any cars that do not look like a stock car/truck will not be legal.
2. Rear panels must be fully enclosed from top of rear deck to bumper and from left quarter panel to right quarter panel.
3. Maximum overall width of any part of the car is 82 inches
4. Bodies may be factory stock production, fabricated stock appearing, or template style. Again the key point is to keep it stock appearing.
5. Bodies may be constructed of sheet metal, aluminum, or fiberglass, Plastic nose/tail bumper covers OK.
6. Nose Rule: Noses must be stock appearing or ABC template style. NO outlaw asphalt or dirt late model noses. Noses must be vertical, not laid back.
7. Tail Panel Rule: Tails must be stock appearing or ABC template style. Tails must match nose and roof. IE: truck to truck, car to car.
8. Roof must include A and B pillars of original type design for that roof and must be centered on the body. IE: Monte to Monte, Camaro to Camaro. No Outlaw teardrop roof with A or B pillar added.
C) Spoiler

1. Maximum spoiler dimensions are 6 ½” X 60”
2. Spoiler must be centered on rear deck and must be made of clear material
3. Supports made of small tube or bar material ok, but must be no higher than the top of the spoiler.
4. No verticals allowed on spoilers, strut or strap style supports only.
D) Engines/transmissions
1. Must be production style cast iron block with cast iron heads. NO ALUMINUM HEADS (April 2012 Amendment, Factory part number crate aluminum heads allowed, 23 degree production head only)
2. Wet sump with internal oil pump only. NO DRY SUMP ENGINES
3. Any intake with any single 2bbl or 4bbl carburetor.
4. Engine set back to be measured at balljoint centerline closest to foreward most spark plug on engine. set back is not to exceed 4" rearward from the foreward most spark plug. engines in the 2.01" range to 4" range are to carry an additional 25# of ballast anchored with 1/2" bolts. chassis with more than 4" of set back are ineligible for competition.

5. No magneto ignitions.

6. Any stock manual or automatic transmission. Must have working reverse gear.

7. Bert/Brinn/other racing transmissions OK

E) Exhaust
1. Headers allowed
2. single or dual exhaust OK.
3. Mufflers are mandatory
4. Exhaust must exit behind driver and may not pass through driver compartment
5. Must be able to pass 100 decibel test.

F) Rear End
1. Stock four link OK
2. Three link ok.
3. Quick change, ford 9 inch OK

G) Brakes
1. Must have working brakes at all four wheels
2. In-cockpit brake adjusters are permitted

H) Suspension
1. Tubular upper control arms allowed
2. Screw jacks allowed
3. Coil over shocks allowed. Shocks must be fully contained with no external components, lines, canisters, etc.

I) Wheels/Hubs
1. Steel made for racing wheels with a maximum width of 8 inches.
2. Wide 5 hubs OK.
3. One inch minimum lug nuts, studs must be flush with outer edge of lug nut
4. Car will be deemed unsafe for racing if more than one stud on any wheel is broken

J) Tires

In an effort to reduce the cost of racing Springport Motor Speedway is introducing a new tire choice to our ABC classes. A used CRA 10” slick will be allowed. SMS will be able to get these tires in large enough quantities to supply the ABC classes. All slicks allowed at SMS will be sold only by SMS and show the SMS branding and stencil. These tires will sell for $20 each or $80 for a set of four. You may also run any treaded 970 tire, either American Racer or Hoosier.

There will be no other tires rules in the abc class. You may qualify heat or feature race on any set of tires you want.

J) Tires
1. Any treaded 970 tires will be allowed, either American Racer or Hoosier
2. No Soak is allowed at Springport Motor Speedway
3. CRA Take-off slicks will be allowed. 
a) All slicks used must be purchased at Springport Motor Speedway and must show the SMS branding and stencil
b) CRA Slicks have a left and right side tire and they must be used that way. No left side tires on the right or right side on the left.
c) CRA Slicks will be available in the tire barn for sale at practice and on race day or by appointment.
d) CRA Slicks will be priced at $20 each.
4) Mounting or dismounting of tires will be $2.50

K) Radios/Mirrors
1. Mirrors are not permitted
2. Radios/two way communication is not permitted. *Exception* the use of a single channel
raceceiver set to the frequency mandated by the speedway will be required.

1. The weight for this series begins with a full stock chassis with stock suspension mounting points. The base weight is 2800 lbs. Additions are made for frame type and other various items. Weight is measured pre-race with driver.
2. Stock frames with rear modification such as 3-link, springs moved, etc - 2850 lbs
3. Stock front sub or stock type tubed front sub with tubed rear - 2900 lbs
4. Full tubed strut type chassis -2950
5. Rack and pinion steering - add 50 lbs
6. Bert/Brinn/other racing type internal clutch transmissions – add 50 lbs
7. Any added weight must be secured with two ½ inch bolts and may not extend below the bottom of the frame rails at any point. All weight must be painted white and have car number clearly marked on it

M) Safety
1. Four post roll cage of quality construction/welding is required. Cage must be constructed of round tubing and may not be black pipe material. Must be welded, not bolted together
2. Center section of cage must have at least 4 door bars on left side and at least 3 on right side.
3. Left side of cage must have 1/8 inch minimum steel plate welded on. Plate must extend front upright to rear upright and from top door bar to frame rail
4. All bars within reach of any part of the drivers body must be padded with approved roll bar padding
5. Aluminum racing seat properly mounted to roll cage is required
6. Properly mounted five point racing/safety harness is required. Harness must have a date tag and be no older than 3 years old
7. Properly mounted window net with quick release is required on the driver’s side
8. A racing fuel cell is mandatory, stock gas tanks are not allowed. If the bottom of the fuel cell is located below the bottom of the frame rails, it must be protected with a steel hoop properly welded to the frame behind the cell
9. Front and rear firewalls must be completely sealed from the driver's compartment
10. Battery must not be located in the driver's compartment
11. Master shut off switch to main battery cable must be placed near driver, preferably on the A pillar, for easy access by driver and safety crew is mandatory
12. Dbl layer fire suit or sgl layer fire suit w/name underwear, gloves, helmet, and race shoes required.
13. Neck brace/Hans device highly recommended.
14. Fully charged and properly mounted fire extinguisher is mandatory; 2.5 lbs. minimum.

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