GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System
GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System

GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System

SKU: BLS4279SCT4L8

GM LS Compatible 427 c.i. Engine and 4L80E Automatic Transmission - 830 Horsepower - Standard Edition Builder Series - Holley Terminator X EFI System

SKU: BLS4279SCT4L8

Horsepower & Torque: 830 Horsepower / 800 ft. lbs. Torque

Cylinder Heads: BluePrint Engines Aluminum Cylinder Heads

Compression Ratio: 9.5:1

Camshaft: Hydraulic Roller Cam - .624 Intake / .624 Exhaust Lift and 239 Intake / 255 Exhaust Duration @ .050 – 114° LSA

Pistons: Forged

Crankshaft: Forged Crank – 4.125" Stroke and Forged 6.125" Rods

Supercharger: Magnuson TVS2650

Fuel Recommendation: 91+ Octane

Holley Terminator X Max - Gen IV Complete ECU/Harness EFI System

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Overview:

BluePrint Engines unleashes serious LS power with this 427 c.i. Builder Series package, delivering a massive 830 horsepower and paired perfectly with a tough, street-proven 4L80E automatic transmission. This combo is built for the enthusiast who wants modern reliability with race-ready punch, all controlled by the Holley Terminator X EFI system for crisp tuning, fast starts, and razor-sharp throttle response. Precision machining, premium internals, and BluePrint’s Pro-series build quality ensure the strength to handle every bit of boost, rpm, and abuse you throw at it. For builders chasing a turnkey LS powerhouse that’s ready to hit the streets, the strip, or anywhere in between, this 427/4L80E package is pure, modern muscle, delivered.

Description: 

  • Horsepower & Torque: 830 Horsepower / 800 ft. lbs. Torque
  • Compression Ratio: 9.5:1
  • BluePrint Engines Aluminum Heads
  • BluePrint Engines Hydraulic Roller Cam
  • BluePrint Engines Forged Crank
  • BluePrint Engines Forged Pistons

Block:

  • BluePrint Engines High Strength Cast Iron Block
  • Increased Deck Thickness and Strength Webbing
  • Extended Cylinder Skirt
  • Priority Main Oiling
  • 6-Bolt Main
  • 1-Piece Rear Main Seal
  • Improved Water Jacket Design
  • Utilizes OEM LS3 Front and Rear Covers

Rotating Assembly:

  • New Forged Crankshaft
  • 4.125" Stroke
  • Forged 6.125" Connecting Rods
  • Forged Pistons
  • Front and Rear Internally Balanced

Cylinder Heads:

  • BluePrint Aluminum Cylinder Heads - PS8015
  • 70cc Chamber
  • 2.165" Intake / 1.590" Exhaust Valves
  • 259cc Intake / 102cc Exhaust Runners

Cam Specs:

  • Hydraulic Roller
  • .624 Intake / .624 Exhaust Lift
  • 239 Intake / 255 Exhaust Duration
  • @.050-114 Degree Lobe Separation

Ignition Timing:

  • ECM Supplied with Calibration

Holley Terminator X Max Specific Features and Benefits:

  • Real Time Fuel Map Learning Simplifies Tuning by Dynamically Adjusting the Base Fuel Rate
  • On Board Bosch LSU 4.9 Wideband Control, Enabling Accurate AFR Readings and Closed Loop Tuning
  • Eight High Impedance Injector Drivers, Ideal for Stock LS Injectors and Holley EFI Injectors
  • Integrated 1-Bar MAP Sensor for Naturally Aspirated or Nitrous Setups, with Harness Support for External Higher Bar Sensors if needed
  • 4 Configurable Inputs (12V, Ground, 5V, Frequency) and 2 Outputs (Ground, PWM) - Ideal for Electric Fans, Boost Control Solenoids, Nitrous Control and more
  • Free PC Tuning Software via USB/CAN Interface for Full Laptop Control and Advance Setup
  • Integrated 3.5" Touchscreen Handheld with Setup Wizard, Internal Data Logging, and Real Time Gauge Displays
  • Terminator X Max ECU will Include a Base Timing Map Pre-Configured for this engine.

Also Includes:

  • Low Profile Rear Sump Oil Pan - BPP81074
  • All Sensors Required for Engine to Run
  • DBW Throttle Body - BPP12191019
  • 2.65 Liter Magnuson TVS 2650 Supercharger
  • Spark Plugs & Wires
  • Harmonic Balancer
  • Timing Cover
  • Valve Covers
  • Coil Packs

Assembled with Complete HD 4l80e Transmission Package:

  • 4L80E Complete Package
  • Electronic Transmission Controller Included
  • 3200+ Stall Torque Converter
  • Flex Plate
  • Starter

4L80E Gear Ratios:

  • 1: 2.482
  • 2: 1.482
  • 3: 1.00
  • 4: 0.750
  • R: 2.077

Notes:

  • This Holley EFI Equipped engine has a fully calibrated ECU by BluePrint Engines. Please DO NOT follow the Holley EFI manual for the calibration of the ECU.
  • Retro fit oil pan will fit most 1955-1995 GM front engine, RWD, V8 cars
    Not for use in pollution-controlled vehicles or in dry sump applications.
  • BluePrint Engines Recommends Air Intake Kit BPPLS01013 to ensure correct MAF calculations and Dyno calibration are maintained with the provided ECU / tuning.
  • Engine/Trans Package Ships assembled
 

    Your BluePrint engine was dyno tested with the parts and specifications listed below.  If you prefer to install a different part, your engine may not produce the horsepower recorded on your dyno sheet.

    Part Number: BLS4279SCT4L8

    Fuel Delivery Type: Supercharged

    Spark Plug: AC Delco 41-985

    Spark Plug Gap: .040"

    Harmonic Balancer: Non-Weighted

    Flexplate/Flywheel: Non-Weighted

    Stall Converter: 3200+

    Intake Manifold: Magnuson TVS2650

    Fuel Recommendation: 91+ Octane

    Timing (Initial/Total Advance): Ignition timing and spark advance are controlled by Powertrain Control Module

    Firing Order: 1,8,7,2,6,5,4,3

    Notes: Recommended break in oil for your BluePrint Crate Engine: BPP710, Not for EGR Universal fit oil pan, drive by wire throttle body and matching throttle pedal. Also includes sensors, coil packs and wiring harness, and a new ECM with our custom tune installed

    Header Partners: 
    Click here for our Header Partners and recommendations.

    Click here to download a copy of the Installation Guide that came with your BluePrint engine.

    BETTER THAN THE REST.

    At BluePrint Engines, customer satisfaction is our highest priority. Every engine is built using high-quality components, with each rotating assembly balanced to within two grams of specification. Before shipment, every crate engine is dyno tested and certified to ensure it is ready to deliver the horsepower and torque you expect.

    To stand behind that level of quality, BluePrint Engines offers industry-leading warranty coverage, providing confidence and peace of mind whether the engine is installed by an individual or a professional installer. Our standard warranty is fully transferable, adding long-term value and reassurance for our customers.

    Warranty Coverage Details:

    • BluePrint Engines (including Builder Series)- Standard Warranty 30 months or 50,000 miles (parts and labor)*
    • BluePrint Engines Extended Warranty- 48 months or unlimited miles (parts and labor)*
    • Race / Motorsports Engines -No warranty
    • Marine Engines- 12 months (parts and labor)
    • Short Blocks-12 months (parts only)
    • Bare Blocks- 6-Month Unaltered
    • International Sales- Warranty coverage is handled by the in-country distributor

    *Applies to eligible engine part numbers beginning with “B” or “P.” Warranty coverage is subject to terms and conditions. Proper installation and maintenance are required.

    Please refer to full warranty documentation for complete details click here.

    IT ALL COMES DOWN TO RESULTS.

    We make sure we hit our target horsepower and proper torque with every crate engine. We use an advanced computerized balancer to get our rotating assemblies within two grams, ensuring silky smooth power over the entire RPM range. That's precisely why our engines sound and run better than our competitors.

    BRAGGING RIGHTS INCLUDED!

    A comprehensive, dyno-generated printout showing these critical specs will accompany your delivered engine. No more guessing or wondering what your installed engine's real-world peak horsepower and torque ratings actually are. Any doubters in the crowd? Simply flash 'em your dyno results!

    This engine will be dyno tested before it ships to you at no additional charge (others charge $500)!

    RECOMMENDED PRODUCTS:
    BluePrint Engines Crate Engine Break-In Oil — 1 Quart
    BluePrint Engines 10w30 Engine Oil - 1 Quart
    TrueBlue Performance Octane Boost
    BluePrint Engines TrueBlue Performance Octane Booster
    BluePrint Engines TrueBlue UltraCool Antifreeze Coolant CONCENTRATE
    BluePrint Engines TrueBlue Power Steering Fluid
    BluePrint Engines TrueBlue Transmission Fluid UNIVERSAL ATF/MTF
    Gen IV LS and 2009+ Gen III Hemi Compatible Oil Filter
    EFI Billet Aluminum Fuel Pressure Bypass Regulator - 40-75 PSI and -10AN ORB - Black
    Liquid Filled Fuel Pressure Gauge - 0-100 PSI
    Muscle car swap LS and Hemi Universal Air Intake Kit
    EFI Fuel Pump and Plumbing Kit BPP5267 - For Fuel injected engines
    BluePrint Engines EFI In-Tank Retrofit Fuel Pump - 450 LPH - Return Style
    GM LS Compatible Water Neck – 45°. For 2.25 DIA LS thermostats with 2.45 overall height
    BluePrint Parts – GM LS2 Compatible Water Neck – Straight. For 2.25 DIA LS thermostats with 2.45 overall height
    GM LS3 Compatible Water Neck