Edelbrock Pat Musi 555ci Crate Engine - Joint Venture

Like all Edelbrock products-the parts are proudly made in the U.S.A.

While Ciarfello handled the engine assembly, Musi was called in for the dyno session. The 555 cracked off 677 hp and 657 lb-ft of torque. Musi said that a switch to EFI would add another 20 to 25 hp due to the better flowing throttle body.

We tested the carbureted version of the Edelbrock/Musi 555 ci. Here, Ciarfello bolts on the 800-cfm Thunder Series AVS carburetor. This carburetor is available in a few exterior finishes, but it is the Qwik-Tune Secondary Air Valve that we like most with this carburetor. This valve is easy to adjust while on the vehicle, and allows virtually limitless calibration of the secondary circuit with simple handtools.

Here is a new kit that Edelbrock is going to offer with this engine, and as a stand-alone system. It is the Pro-Flo XT fuel-injection system, by EFI Systems, and it is a follow-up to the Pro-Flo system. The XT system is designed for street cars with high impedance fuel injectors. Think of it as a basic version of the Pro-Flo EFI that Musi employs on his Pro Street and Pro Mod racing engines.