Engine specifications: displacement: 555 c.i.d. Horsepower: 676 hp. Torque: 649 ft-lbs. Compression: 10.0:1. Block: big-block 9.8 in. Crankshaft: forged steel 4.250 in. Pistons: forged. Camshaft: Rollin Thunder hydraulic roller #2264. Rocker arms: 1.7:1 roller. Manifold: Victor jr. 454-r #2902. Cylinder heads: E-CNC #79555. Carburetor: Thunder series AVS. Distributor: included. Valve covers: cast aluminum. Warranty: 2-year/unlimited mileage -Edelbrock/musi 555 crate engines are a powerful big cubic in. package that features the all new Edelbrock E-CNC cylinder heads for the ultimate in Edelbrock performance. E-CNC cylinder heads are fully CNC ported to achieve optimal air-flow for maximum hp & torque in high performance street & light duty racing applications. They feature exhaust port exits in the stock location, which allows for the use of off-the-shelf headers. They are available in three options. Carbureted & w/ Pro-Flo 2 or Pro-Flo XT electronic fuel injection. Each engine is assembled by 8-time pro street world champ pat musi. They all deliver maximum hp & torque on 91 octane. The carbureted package includes a Victor jr. Intake manifold & 800cfm Thunder series AVS carburetor. It delivers an incredible 676 hp & 649 ft-lbs of torque. .