Not going anywhere for a while?
http://www.usacracing.com/USAC/Rule_Book.html
Sprint Car specific -
http://www.usacracing.com/USAC/Rule_Book_files/2008rb_appendixd_1.pdf
Section 303F might be of some interest to you
Section 314 does not mention specific tire compounds but does make threatening noises about altering the tires although I've never heard of anyone penalized for doing so. The current requirement calls for you to run a Hoosier turd ...er... DT3 on the right rear.
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