PRO-4 WEST MODIFIED RULES

*** UPDATES POSTED FOR THE 2009 - 2010 SEASON***

Last updated: 3-24-10

***The Jr Pro 4's have now joined the Pro 4's to create one larger class instead of the 2 smaller classes.***

1. Any American or Foreign hardtop car with 87" minimum and 102" maximum wheelbase.  No convertibles or roadsters.

2. Bodies: Must be either O.E.M. or aftermarket stock appearing.  Up to 30% may be trimmed off O.E.M. body, fender wells, front cowls, tail section, door posts or rocker panes or lower quarter panes. If you have any questions ask the Association.  The front wheels remain open.  Bodies, engines and frames do not have to be from the same manufacturer.  No straight axles.  Body damage must be kept to a minimum.  ***BODY----- NOW ALLOWING TRUCKS AND STATION WAGONS***

3. Weight:  

      A. Minimum weight (including 8 gallons gas and driver) 1 lb. per C.C.

    B. Absolute minimum dry weight is 1250.

    A. No rotary or twin overhead cam engines allowed.

    B. Maximum 4 spark plugs.

    C. Maximum 8 valves.

    D. Maximum C.C.'s 2400 +.30.

    E. Head and block casting must be mass produced for highway use. Esslinger D-Port replacement head (part # M-6049-E23A) allowed with a 100 pound weight penalty. The weight penalty will be revaluated after 4 races and adjusted accordingly.

    F. All engines must be centered to within 1 " of center of the car (side to side) using the crankshaft as a center point.  The center of the car will be half the distance between the top front balljoints.

    G. Engines must be in front of the driver or behind the rear axle in a conventional manner.

    H. Engine setback will not exceed 10% of the wheelbase measured from #1 spark plug to the center of the right front top balljoint.

    I. Only massed produced for highway use engines allowed.

    J. No aftermarket crankshaft allowed. Crankshaft part numbers must be in factory parts catalog.

    K. Carburetion only, limited to 4 venturies. No turbos, superchargers or fuel injection.

5. Chassis:

    A. The driver must remain within the main frame rails and roll cage area.

    B. Maximum track width is 76" outside wheel to outside wheel.

6. Fuel: Gasoline only. No nitrous oxide.

7. Transmissions: Must have a minimum of two forward gears and one reverse gear.

8. Self starting only. Must have starter in good working order.

    A. Roll cage material must be at least 1 1/2" round tubing of .090 thickness. Three side bars are required on the driver's side not including the main rail. Two side bars are required on the right not including the main rail. Any driver who sits within 14 of the right side must have a third right side bar. The roll cage must be constructed as to protect the driver from any angle. Gussets are required in the main cage area. Cage must be padded in the head and arm area. The tech committee has the right to prevent any car from racing if they feel that the car is not safe!'

    B. 3" lap belts in good working order with 2" shoulder harness and "antisubmarine" belt required and must be properly attached to roll cage.

    C. An approved window net is required on the driver's side or both sides if the driver sits within 14" of both sides.

    D. A one quart overflow can on water cooled cars and a quart oil catch can required on all cars.

    E. 3/16" scatter shield or blanket 180 degrees around clutch required.

    F. Fuel cells required. Maximum capacity is 8 U.S. gallons. Fuel tanks must be mounted to frame. Fuel cell container is required on all new fuel cells.

    G. Bumpers must be centered to within 1 " of 15" from the ground and must be a minimum of 4" high. Ends must be rounded or turned inward. Front bumper can only be chassis width. Rear bumper should extend to 1 " of the outside of the tire. Side scrub rails are required and must be at least 1 1/2" .090 tubing. Scrub rail is attached to the frame and extend to within 1" of the outside of the rear tire. Scrub rail must be 15" + or - 1" from the ground.

    H. Seat must be securely mounted to the roll cage and frame at the bottom and back of the seat. No more than 1 1/2" padding allowed.

    I. A firewall of at least 20 gauge steel must separate the driver from the gas, battery, radiator and engine. On rear engine cars a like firewall must also separate the engine from the fuel tank.

    J. All 4 wheels must have brakes in good working order.

    K. A padded headrest must be attached to the car.

    L. Driver must wear a S.F.I. approved fire suit and a Snell 95 or better helmet.

    M. Front engine cars must have a driveshaft safety loop 10" back from the transmission.

    N. Fire extinguishers or a fire extinguishing system are required. 

    O. Steering wheel must have an approved pad on the center.

    P. A battery kill switch must be installed and easily accessible to crew members. The switch must be clearly labeled and marked “On and Off.”

13. Tires and wheels:

    A. Maximum tire width is 11 ". (Manufacturer's stamping)

    B. Maximum wheel width is 10".

    C. Steel or manufacturer approved racing wheels only.

    D. Each car is allowed only one new set of dirt and pavement tires each season. Replacement of one new tire per race only. Second set of tires will be voted on mid season.

14. General:

    A. Numbers must be neatly painted and be between 12" and 18" on both sides of car. A number 24" high is to be painted on the top and read from the passenger's side. A 6" number is to be painted on the rear to the left side.

    B. Driver's name in 3" letters above the right door.

    C. Hood required, and engine size should be painted on hood

    D. You must race 2/3 of the scheduled races in order to qualify for any points fund money. (In case of rain outs 2/3 of races ran)

15. Mufflers:

    A. Mufflers or supertraps required. Track rules apply.

16. Protests:

    A. A protest of the finish or rules must be filed in writing with an officer of Pro 4 West within 15 minutes of the posting of the official results. Cost for bringing someone up for protest is $10.00, which you will get back if you are successful.

    B. Any competitor willfully violating the rules of Pro 4 West will be dealt with by means of loss of payoff, points, and/or membership.

    C. Pro 4 West reserves the right to inspect any car at any time at the track.

17. These rules are recommended for the safety of the drivers and other members. Pro-4 West takes no responsibility for any accidents or injuries under any circumstances.

***Note:   Underlined items have been changed, updated or added in the latest revision of the rules***