This article is from the Motorsport FAQ, by A H Henry bspahh@midge.bath.ac.uk with numerous contributions by others.
The 1994 rules allow the cars to have a maximum length of 195 inches,
with 190 inches being the required minimum. The maximum allowed width
is 78.5 inches measured by projecting a line from the outside rim
surface through the hub center. The maximum height of the car from the
highest point to the lowest point is 32 inches. The maximum rear wing
height is 32 inches at the superspeedways and 36 inches on short ovals
and road courses. The cockpit must have a minimum opening of 30 inches
by 14 3/4 inches. An unfueled car, complete with lubricants, coolants,
tyres, etc. must have a minimum weight of 1550 pounds.
 
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