Based on NMCA Factory Super Cars performance data from the first two NMCA events of the 2019 season, the NMCA Technical Department made the following adjustments effective immediately: 1. Increase the supercharger top pulley size on the 2019 COPO 350 combination from 3.350 inches to 3.500 inches. This will decrease the 2019 COPO 350 combination supercharger overdrive from 147.5 percent to 136.6 percent overdrive or 10.9 percent. 2. Increase the 2019 Cobra Jet 327 combination from 3.250 inches to 3.500 inches. This will decrease the 2019 Cobra Jet 327 combination supercharger overdrive from 146.2 percent to 128.6 percent or 17.6 percent. As a reminder, no other changes may be made to any approved superchargers, including, but not limited to: (upper or lower pulley sizes, gear ratios, cases, rotors, etc.). All other permitted combinations in the NMCA Holley EFI Factory Super Cars class will remain unchanged. This rule adjustment will go into effect immediately. NMCA reserves the right to make additional rule changes at any time to control performance and maintain parity in the Factory Super Cars class. All 2019 NMCA Rulebook Amendments and Clarifications can be found under the 2019 Rules Revisions & Clarifications link HERE.