BluePrint’s BP38321SP GM Small Block compatible performance crate engine are dyno tested at our factory with a Holley Classic 750 CFM Carburetor, and H8002K Cylinder heads to get 432 horsepower and 450 minimum torque values. This engine features a 4-inch bore which mathematically yields a 377ci with a 3.75-inch stroke. This customizable engine comes with timing cover, harmonic balancer, oil pan, hydraulic roller cam with 1.5-inch rocker arm, and a high-volume oil pump.