-10% HP Stealth Ram EFI Kit, Small Block Chevy, Early to Late Heads

You’ll get some attention when you pop the hood and show an HP Stealth Ram™ Multi-Port EFI system! Available for traditional or Vortec headed SB Chevys. Simply utilize a laptop (or the optional 5.7” full color touch screen LCD) along with the HP’s self-tuning capabilities to make it as easy as 1, 2, 3 to get your car up and running with EFI. The tunnel ram design of the Stealth Ram™ builds power in the upper RPM while maintaining excellent mid-range torque as well.

HP Stealth Ram™ systems include: intake manifold, billet throttle body, ECU, wiring harness, fuel rails and related small parts. Fuel pump and injectors should be selected separately to fit your requirements.

Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed inputs, fuel pump control, AC inputs, timing retard inputs and various other uses. When selecting an ECU, users need to ensure their planned controls can be run with the 4 inputs and 4 outputs as certain combinations may use more I/Os than are available. If more I/Os are required, users should choose the Dominator VMS.

Not Sure? Review this product documentation before you buy!

Installation Manual
Holley HP Stealth Ram for Small Block Chevy

Installation Instructions
Holley TPI Throttle Bodies

Boost ControlIntegrated (Utilizing at least two I/O Ports.) Control based on time, gear, speend, and/or manual selection. Requires 557-200 Boost Control Solenoid Valve.
DIS OutputsCan drive up to 8 "smart" or Holley coils (can drive 2-wire coils with 554-112 Coil Driver)
Fueling StrategySpeed Density, Alpha-N, or Combination
Includes Power HarnessNo (Purchase 558-308 Seperately)
Injector DriversEight Sequentially-Driven Peak & Hold Drivers capable of driving up to 16 low or high impedance injectors
Internal Datalogging4 GB
Knock Control Channels2
Nitrous ControlIntegrated 4 Stage (Utilizing at least two I/O ports.) Progressive control utilizing 554-111 solenoid driver.
Number of Cylinders4, 6, or 8 (Even Fire Only)
User Configurable I/O4 programmable PWM outputs (2 high and 2 low) and 4 fully configurable inputs.
User-Selectable MAP StorageN/A
Water-Methanol ControlIntegrated (Utilizing at least two I/O Ports.) Recommend Holley Water-Methanol pump, nozzles, and install kit.
Throttle Bodies
Airflow Rate (CFM)1000 CFM
Barrels (BBL)2
Gaskets IncludedYes
IAC Motor IncludedYes
Injectors IncludedYes
StyleMulti-Point Fuel Injection
Throttle Bore Diameter (ea)58 mm
TPS Sensor IncludedYes
Intake Manifolds
Complete ManifoldYes
Fuel Rail IncludedYes
Manifold TypeStealth Ram
Rear Height10.25 Inches
RPM RangeIdle - 6500 RPM
Throttle Body FlangeGM TPI
Fuel Pressure Regulators
Pressure Range35 psi - 65 psi
RebuildableYes (PN 512-1)
StyleMounted on Fuel Rail
Fuel Rails
Inside Diameter3/8" / -6 AN
Fuel Filters
Element MaterialPaper
Filter TypeInline
Micron FiltrationPrefilter: 20 Micron / Postfilter: 10 Micron
Mounting Bracket IncludedPrefilter: No / Postfilter: Yes
Outside DiameterPrefilter: 1.94 Inches / Postfilter: 2.17 Inches
Harness TypePower Harness, MPFI Main Harness, v8 Injector Harness, Small Cap HEI Distributor Adapter Harness, Ignition Adapter Harness
Crank Timing
Sensor Harness IncludedNo (Ignition Adapter for Small Cap HEI Distributor Only)
Type1 BAR MAP, Throttle Position (Integrated in TB); Coolant Temperature, Wideband O2 (Bosch) and Air Temperature Sensor; Oil and Fuel Pressure Sensors optional, not included
Also IncludedMechanical Fuel Pump Block-off Plate
ApplicationSmall Block Chevrolet, Early to Late Heads
ColorSatin Aluminum Intake Manifold and Plenum. Clear Billet Aluminum Throttle Body with Red Throttle Blades
Emission Code3
Unit of SaleKit

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HP Stealth Ram EFI Kit, Small Block Chevy, Early to Late Heads

  • Views: 10739
  • Brand: Holley
  • Product Code: 550-820
  • Availability: In Stock
  • $4,517.00
  • $4,064.95

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