Holley 750 cfm 4150 Series Mechanical Secondary Brawler Street Carby # BR-67320Holley 750 cfm 4150 Series Mechanical Secondary Brawler Street Carby # BR 67320 Features: All models have dual inlet fuel bowls with sight glass windows for safe and easy float adjustments Brawler Street models include red billet metering blocks and throttle bodies with precision throttle shafts to ensure long term performance Changeable idle and high speed air bleeds for easy tuning along with four corner idle adjustment on mechanical secondary