GM Performance 19433041 ZZ6 Base SBC Crate Engine - 405 HPSBC Crate Engine ZZ6 Base 405 HP Crate Engine 350 Cubic Inch 405 HP Small Block Chevy CHEVROLET PERFORMANCES ICONIC 350 BASED ZZ ENGINE FAMILY CONTINUES THE LEGACY Chevrolet Performances new ZZ6 delivers more power than any 350 Small Block ever installed in a production vehicle. Rated at 405 hp and 406 lb. ft. of torque, it derives its range topping performance from unique, lightweight aluminum cylinder heads that enable optimal airflow at high rpm.