A list/memo of rules changes for USAC Sprints, Midgets, and Silver Crown cars in 2007 has been posted at:
http://www.usacracing.com/images/stories/Files/2007%20Rules/2007Changes.pdf
Among the changes for USAC/CRA Sprints:
-Required Head & Neck Restraint System. (HANS, R3, Hutchens II, Hutchens Hybrid)
-Required One-Way Radio System.
-Side Panels are allowed to extend to rear down tube. (see 2007 rule book)
-Dish noses are now allowed. (see 2007 rule book)
-Side Visors are allowed. (see 2007 rule book)
-USAC/CRA Weight Rule is now 1175 lbs.
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