600 CFM - 4150 - Mechanical Secondaries - Shiny - Gasoline;Shiny finish for good looks; Optimized street/strip calibration that works out-of-the-box; Manual choke (Cable driven, hand operated) for precise cold start control; Mechanical secondaries for awesome tire turning performance; Dual accelerator pumps for additional fuel under initial acceleration; Dual feed fuel inlets for constant high volume fuel delivery; Intended for lightweight vehicles w/ manual trans or automatics with high stall & low gearing; 100% wet-flow tested by Holley technicians to assure it arrives ready to run!;