Today, the NMCA Tech Committee released updated preliminary rules in the following classes today: 1. General Regulations Addressed multiple entries in index classes. 2. Nitrous Pro Street Billet Cylinder Head rule updates. 3. Factory Super Cars - Clarified the 2020-21 Dodge//Hemi combination. The 2021 NMCA Preliminary Class Rules can be found here: https://www.nmcadigital.com/2021-class-rules-payouts/