Edelbrock Crate Engine Edelbrock/Pat Musi 555 RPM XT BBC 675 HP Stock Exhaust Port LocationThe Edelbrock Musi 555 part #49550 Big Block Chevy crate engine is a powerful big cubic inch package that features the all new Edelbrock E CNC cylinder heads for the ultimate in performance. This engine delivers an incredible 676 horsepower and 649 ft lbs. of torque on 91 octane pumps gas. The Edelbrock E CNC cylinder heads are fully CNC ported to achieve optimal air flow for maximum horsepower and torque in high Performance's street and light duty