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Nevermind. I found something:
USAC TECHNICAL UPDATE – TB2018-NAT001
NATIONAL SERIES
Date: JANUARY 1, 2018
ALL NATIONAL SERIES
Digital bleeders are allowed. Air may not be introduced to the tire. Bleeders may not be controlled remotely.
Full containment seats mandatory beginning May 1, 2018. Beginning in 2019 all seats must meat SFI 39.2 specifications.
Silver Crown Series
Tire options for events in 2018 remain the same as 2017
National Sprint
Suspension adjustments by the driver from the cockpit will not be permitted.
Front axle tethers will be mandatory beginning May 1, 2018.
Hoosier will make 94/14.0 available in RD12 compound.
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