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Off of the 2010 USAC rule book,
The front part of the body, known as the nose assembly, shall not be wider than the parallel lines of the body and may
not exceed the width of the frame. The nose assembly may not extend forward beyond the confines of the front bumper.
The top surface of the nose may not be dished or concave more than one (1) inch. This dimension will be measured
from a straight edge lying on the longitudinal axis of the car. This one (1) inch dimension includes any flairs or wicker
bills. Vertical spill plates are not allowed. (See Illustration #7.)
The positioning of the nose may not extend above or below the downtube more than two inches. (See Illustration #6.)
Any air deflector that is used to direct air for cooling shall be completely inside the confines of the nose and the solid
sides of the nose shall cover this deflector. This deflector will not be movable
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