Based on NMRA Limited Street performance data from the 19thAnnual NMRA Ford Motorsports Nationals on June 27-30, 2019, the NMRA Technical Department made the following adjustments effective immediately for these Limited Street combinations: TVS GEN3R SUPERCHARGER approved upper pulley size, changed from 3.228 to 3.400. This changed the 2.317:1 lower/upper pulley ratio to the now approved 2.200 lower/upper pulley ratio. All other permitted combinations in the NMRA Advanced Fuel Dynamics class will remain unchanged. These rule adjustments will go into effect immediately. NMRA reserves the right to make additional rule changes at any time to control performance and maintain parity in the NMRA Limited Street class. All 2019 NMRA Rulebook Amendments and Clarifications can be found under the 2019 Rules Revisions & Clarifications link at: https://www.nmradigital.com/2019-event-info/class-rules-payouts/.