April 9, 2009

USAC Technical Bulletin

Junior Ford Focus intake restrictor plugs and intake tubes must be


installed in a manner that insures that all air entering into the engine


intake passes through the throat of the restrictor. When measured at the


narrowest point, the throat of the restrictor must not exceed .755


inches. The entry and exit taper dimensions, as measured with the


existing taper gauge, remain unchanged. Any attempt to allow air and/or


fuel to enter the intake through any other passage than the throat of


the restrictor will be considered an attempt to defeat the restrictor


and will result in disqualification or other penalties deemed


appropriate by USAC officials.