— Beginning with the 2024 season, all chassis in USAC’s AMSOIL Sprint Car National Championship division will be required to have additional bars installed to support and decrease the span between the front and rear uprights in the drivers area. The new support bars must be in addition to the front and rear. It must be attached to the top rail at a point 15-20 inches from the rear of the front. It must attach to the hip rail and have a gusset attached to the rear upright near a point opposite of the rear brace/shock mount bar. The curve must be between 4-7 inches measured from outside of the rear upright tube to the outside of the support bar. A support bar may be added to the top rail at a point 15-20 inches from the rear of the front upright and to the rear upright near a point of the rear brace/shock mount bar but no higher than 7 inches above the hip.

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