Holley 0-81770 Model 4150 Street Avenger 770 CFM 4-Barrel Vacuum Secondary Manual Choke New Carburetor

• Includes PCV, spark, power brake, and vacuum ports
• Adjustable vacuum secondary is calibrated for optimal street performance
• Fuel metering system provides great low-end torque, acceleration, and top-end horsepower
• 4th generation power valve with million-mile blowout protection
• Offers up to 6-percent more acceleration or 5-percent better fuel economy

This carburetor is designed for the street enthusiast and has an adjustable vacuum secondary which is calibrated specifically for optimal street performance. It offers up to 6-percent more acceleration or 5-percent better fuel economy with a simple spring change. It includes a fuel metering system which provides precise fuel metering for great low-end torque, acceleration, and top-end horsepower. It also includes 4 vacuum ports and an adjustable needle and seat to accommodate varying fuel pressure levels. The built-in fuel inlet filters are cleaner, safer, and are used in primary and secondary fuel bowls.