OK to use spacers?

[702 bullitt]

Just wondering if there is a rule for test & tune night at the dragstrip to use them or not on drag radials? I have Weld Prostars 15x8 with a 5.5 back spacing and needed a 7/32 spacer to clear my rear brake calipers. What about when competeing at a national event like Ford World Challenge?

 

[BO94ZA4]

Most do not have an actual "rule" on spacers. As long as there is enough thread for the lug nut to use properly and the spacers are a one piece design it should pass tech.