Size of competition number?

[mat H/SA]

Hi i am changing my lettering on my car and i would like to know the ruling on the letter and number dimension allowed

Thanks for the help!

[Jeff Kempton]

From the NHRA 2012 Rulebook, General Regulations, Section 20 Page 30:

"7:2 COMPETITION NUMBERS
All contestants are required to display a permanent driver number
at all NHRA Full Throttle Drag Racing Series national events,
NHRA Lucas Oil Drag Racing Series divisional events, divisional
NHRA Summit Racing Series Finals, and divisional National Open
events. Numbers on side windows must be a minimum 6 inches
high and 1 1/2 inches wide. Class designation letters must be a
minimum 3 inches high and 1 inch wide. Driver’s competition
number and class designation must be displayed in a legible
manner in a contrasting color to the vehicle’s background color, or
light color on windows, in a prominent position, and be clearly
visible to the tower personnel. Class and numbers must be in the
form of permanent decals or paint. The use of shoe polish in any
form is prohibited."

[mat H/SA]

Thanks Jeff!!