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Edelbrock 47550

Edelbrock Musi 555 RPM XT EFI 723hp Big Block Chevy Crate Engine


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Edelbrock Musi 555 RPM XT EFI 723hp Big Block Chevy Crate Engine $20,009.99
Out of stock
To order this item contact Customer Service at 1-800-345-4545.
Edelbrock/Musi 555 RPM XT EFI Crate Engine
  • Big Block Chevy 555ci
  • 723 HP, 652 ft/lbs
  • E-CNC Cylinder Heads
  • Pro-Flo XT EFI
  • Water pump not included
  • Edelbrock 47550 Details

    Electronic Fuel Injection

    The Edelbrock/Musi 555ci big-block Chevy is a powerful package and features Edelbrock's precision Pro-Flo XT electronic fuel injection. The Pro-Flo XT EFI system consists of a newly engineered intake manifold with a unique design delivers more horsepower and torque than a traditional single-plane intake manifold. The system also includes fuel injectors, fuel rails, fuel pump, throttle body, electronic engine control unit (ECU) and handheld calibration module. This engine can be tuned with the handheld calibration module or with a laptop.

    After detailed assembly and dyno testing, you can rest assured that each motor was constructed by hand with the utmost quality and care by Pat Musi, applying 37+ years of big block Chevy experience.
    2 year/unlimited mileage warranty.


  • Displacement: 555 c.i.d.
  • Horsepower: 723
  • Torque: 652
  • Compression Ratio: 10:1
  • Bore/Stroke: 4.560" x 4.250"
  • Max Recommended RPM: 6500
  • Block: Big Block 9.8"
  • Crank: Forged steel 4.250"
  • Pistons: Forged
  • Rods: H-beam
  • Camshaft: Rollin Thunder Hydraulic Roller
  • Rocker Arms: 1.7:1 Roller
  • Cylinder Heads: E-CNC (350-79559)
  • Intake Manifold: Victor Jr. EFI
  • EFI: Pro-Flo XT (350-35593)
  • Distributor: Included
  • Fuel Pump: Included
  • Oil Pan: 6-Quart
  • Valve Covers: Cast Aluminum

  • Specifications:

    Engine Make/Size
    Chevy Big Block
    Engine Assembly Style
    Long block
    Engine Balance
    RPM Power Range
    RPM Power Range
    Compression Ratio
    10.0: 1
    Cylinder Heads Included
    Camshaft Style
    Hydraulic roller tappet
    Crate Engine Cylinder Head Material
    Intake Manifold Included
    Carburetor Included
    Throttle Body Included
    Distributor Included
    Oil Pan Included
    Timing Cover Included
    Water Pump Included
    Harmonic Balancer Included
    Valve Covers Included
    Flexplate Included
    Flywheel Included
    Air Cleaner Included
    Spark Plugs Included
    Spark Plug Wires Included
    Fuel Delivery
    Fuel Injection
    Computer Included
    Wiring Harness Included
    Rear Main Seal Style
    Sold individually
    Not Legal
    CARB EO Number
    CARB EO Number
    Manufacturer's Part Number:
    Shipping Weight:
    Package Height:
    Package Depth:
    Package Width:


    Edelbrock/Musi 555 crate engines are a powerful big cubic inch package that feature the all new Edelbrock E-CNC cylinder heads for the ultimate in Edelbrock performance. E-CNC cylinder heads are fully CNC ported to achieve optimal air-flow for maximum horsepower and torque in high-performance street and light-duty racing applications. They feature exhaust port exits in the stock location, which allow for the use of off-the-shelf headers. They are available in three options: carbureted and with Pro-Flo 2 or Pro-Flo XT electronic fuel injection. Each engine is assembled by 8-time Pro Street World Champ Pat Musi. They all deliver maximum HP and torque on 91 octane.

    What is the weight of this engine as shown

    Asked by: daddy b
    The weight of this engine is approximately 650 lbs.
    Answered by: Rusty B
    Date published: 2018-10-08

    I am thinking of this engine for a building project. my only concern is finding a suitable manual transmission setup along the lines of a Tremec 6 speed can these be identified and bought as a package?

    Asked by: whittler257
    You can talk with one of our technicians and we can match up your application.
    Answered by: Rusty B
    Date published: 2018-05-29

    I have a 1977 chevy malibu classic will this engine fit in my car

    Asked by: art123
    With the proper mounts, this will bolt into the '77 Malibu.
    Answered by: Jon Jegs Tech
    Date published: 2018-02-23
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    Some parts are not legal for use in California or other states with similar laws / regulations

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