Sierra Remanufactured CarburetorsSierra Carburetors are precision remanufactured to meet or exceed OEM specifications. Sierra Carburetors have been re-calibrated and re-engineered to maximize fuel efficiency and performance. All carburetors are flow tested throughout the entire throttle range. Fuel mixture and idle settings are pre-set to ensure that only minor idle and choke adjustments are necessary during installation. All bases are resurfaced, and throttle shaft bushings are replaced. Gasket is included.• Sierra Part 18-7637• 600 CFM Holley 4V (Front Inlet) 600 CFM Holley 4V (Front Inlet) Meets or exceeds OEM specs Gasket included | Remanufactured Holley Carburetor, Part 18-7637