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Based in Mooresville, North Carolina, Pat Musi Racing Engines is a one-stop shop for sportsman engines with a Pro Mod pedigree. Pat Musi Racing Engines controls every component of the engine, from in-house manifolds to custom cylinder heads.

Pat Musi has been at the forefront of electronic fuel injection (EFI) technology for over two decades, and that experience is available to every customer with custom-designed EFI systems, exclusive software and individualized tuning. Whether going rounds in Super Comp or setting records in Pro Nitrous, each customer receives the same quality and workmanship Pat Musi Racing Engines is known for worldwide.


The Edelbrock/Musi 555 RPM Pro-Flo 4 performance crate engine is complete with Pro-Flo 4 electronic fuel injection and is assembled with intake manifold, fuel injectors, fuel rails and throttle body, electronic engine control unit (ECU), handheld calibration module, high quality billet distributor, complete harness, O2 sensor & bung, fuel hose, hardware and software. This engine can be fine-tuned with the handheld calibration module without the need for a laptop.

Features Include:


Pro-Flo 4 Fuel Injection


697 horsepower with 643 ft-lbs of torque


Tuned to run on 91-octane pump gas


Competition ready yet ultra-reliable for daily street use

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379-B Timber Rd
Mooresville, NC 28115

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