Overview: The Pro Stock Class is the stock class for advanced builders.
The Pro Stock class rules are more lenient than the pure stock class. There is
no maximum wheelbase restriction, and different wheel and axle makes are
The main body structure must be made of wood.
Car is eligible to race for a 12 month period
from registration date. (Example: a car registered in November 25th, 2007 is
eligible to race until 12 midnight on November 25th, 2008)
Width - Not to exceed 2 3/4 inches (7cm)
Length - Not over 7 inches (17.8 cm)
Weight - Not over 5 ounces on scale accurate to 1/10 ounce.
Height- Not to exceed 2 3/4 inches (7cm)
E. Center Rail Clearance –
Cars must clear the center rail which is 1 3/4 inches wide by 1/4 inch tall
along the entire center length of car.
Body design may be enhanced by adding other stable materials such as plastic
or metal. All additions must be firmly attached and conform to the size
No part of the car body may protrude in front of the starting peg.
There should be an unpainted, unfinished wood surface on the underside of the
car at least 1/2 x 1" (12 x 26 mm) to be used for a WIRL car number stamp.
The following items are PROHIBITED:
Starting devices or propellants
Electronic or lighting devices
Liquids, wet paint, oil, sticky substance, or powders of any kind (other
than axle lubrication)
Glass or excessively fragile parts
Loose objects on car
Pro Stock wheels
must conform to the following specifications:
tread surface of no less than 7.5 mm
Wheels must be
constructed of plastic, rubber, or polyurethane
There must be at least four wheels on the car, however it is not required that
all four wheels make contact with the track surface.
The wheels must be attached directly to axle and spin freely.
Axles must not
be connected to any device that mechanically alters rotation and spin.
Lubricants must be dry on the axle at race time. Wet, oily, or greasy axles
are not allowed. Over-application of lubricant which results in excessive
shedding onto the track is not allowed. Approved lubricants include (but are
not limited to) graphite, Teflon, and Nyloil.
organizers reserve the right to reclassify or disqualify any car at their