The Edelbrock/Musi 555 Pro-Flo 4 XT is the most powerful package in our line and features the Pro-Flo 4 XT electronic fuel injection. The Pro-Flo 4 XT EFI system consists of a front mount 90mm throttle body design manifold with a large plenum and tapered runners that deliver more horsepower and torque than a traditional single-plane intake manifold. The system also includes fuel injectors, fuel rails, throttle body, electronic engine control unit (ECU).
Like the Pro-Flo 4 single-plane application, this engine is ready to run right out of the crate with pre-loaded calibrations. The E-Tuner app uses a Bluetooth wireless connection to communicate with the ECU’s self-learning capability to continually adjust the calibration to get the maximum performance of your engine.
Displacement: 555 c.i.d. Horsepower: 723 hp Torque: 652 ft-lbs Compression: 10.0:1 Block: Big-Block (9.8″ deck height) Crankshaft: Forged Steel 4.250″ Pistons: Forged Camshaft: Rollin’ Thunder Hydraulic Roller #2264 Rocker Arms: 1.7:1 Roller #77790 EFI Systems: Pro-Flo 4 XT #35883 Cylinder Heads: E-CNC #79555 Distributor: Included Valve Covers: Cast Aluminum Warranty: 2-Year / Unlimited Mileage
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