555 cubic inches of big-block making 723 horsepower, assembled by Pat Musi Racing Engines rather than on a production line, and topped with Pro-Flo 4 XT sequential EFI so it runs on pre-loaded calibrations out of the crate. The detail that saves money at install time is the cylinder head design: the exhaust ports stay in the stock location, so ordinary off-the-shelf headers fit instead of custom fabrication.

Edelbrock 49557 Musi 555 Crate Engine Specifications:

• 555 cubic inch big-block Chevrolet long block, 100 percent new, rated at 723 hp.
• Pro-Flo 4 XT sequential multi-port EFI induction.
• E-CNC ported aluminum cylinder heads with exhaust ports in the factory location.
• Intended for high performance street and light-duty racing use.
• Backed by a two year unlimited mileage warranty.