Edelbrock 49557 Edelbrock/Musi 555 RPM XT EFI 723 HP

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