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Blueprint Engines PSLS4271CT

GM LS 427ci Base Upgrade FI Engine, for '98-'10 Gen 3 & 4 Engines

Blueprint Engines PSLS4271CT


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Estimated to ship directly from the manufacturer on 06/06/18
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Truck Freight: $189.00
Blueprint Engines PSLS4271CT GM LS 427ci Base Upgrade FI Engine, for '98-'10 Gen 3 & 4 Engines $9,045.00
LS 427ci Base Upgrade FI Engine
  • Upgrade for 1998-2010 Gen 3/Gen 4 Engines
  • 625 HP, 565 TQ

  • Blueprint Engines PSLS4271CT Details

    Upgrade Engine

    Upgrade your 1998 through 2010 Gen 3 or 4 engine with this new 625 HP 427 cubic inch powerhouse specifically designed to replace an existing LS engine. Assembled with new GM block and Blueprint heads, forged crank, rods, and pistons. The engine includes a performance hydraulic roller cam and lifters and upgraded roller rockers. Built with a Gen 4 style 58x reluctor and sensors, this engine is a drop in for Gen 4 applications, and by using Blueprint's conversion kit (sold separately), you can also install into earlier Gen 3 applications. Free "retune" of your ECM included (requires sending ECM to Blueprint). 91 octane or better recommended. Engine includes intake manifold, timing cover, valley cover, and rear cover. Injectors, rails, throttle body, coil packs, valve covers, water pump, and oil pan NOT included. In many cases, original parts can be used.

    Recommended Stall Converter: 2200+ RPM
    Recommended Fuel: 91 Octane

  • New GM block with 1-piece rear main seal
  • New Blueprint Cylinder Heads p/n 138-PS8015 with roller rocker arms
  • Recommended Spark Plugs: ACDelco 41-985
  • GM L92 Intake

    Rotating Assembly
  • Forged Crankshaft: 4.125" Stroke
  • Forged Connecting Rods: 6.125"
  • Mahle Forged Pistons
  • 11:1 Compression
  • Internally Balanced

    Camshaft Specs
  • Hydraulic Roller
  • Duration at .050'' Lift: 239 Intake, 255 Exhaust
  • Lift: .624'' Intake, .624'' Exhaust
  • Lobe Separation: 114°

  • Specifications:

    Engine Make/Size
    Chevy LS Series
    Engine Assembly Style
    Long block
    Engine Balance
    RPM Power Range
    Cylinder Heads Included
    Crate Engine Cylinder Head Material
    Camshaft Style
    Hydraulic roller tappet
    Intake Manifold Included
    Carburetor Included
    Distributor Included
    Throttle Body 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
    Computer Included
    Wiring Harness Included
    Rear Main Seal Style
    Sold individually
    Not Legal
    CARB EO Number
    CARB EO Number
    Manufacturer's Part Number:

    Retrofit Engines
    Here's all you need to install a 427 cubic inch beast into your ride: new GM block; new Blueprint cylinder heads; forged crank, pistons, and rods; performance hydraulic roller camshaft, lifters, and roller rockers; oil pan.

    Upgrade Engine
    Swap your 1998-2010 Gen 3 or 4 engine for a 625HP 427 cubic inch powerhouse! This engine is specifically designed to replace existing LS engines. Assembled with new GM block and new Blueprint cylinder heads, plus forged crank, pistons, and rods. The engine also includes a performance hydraulic roller camshaft & lifters with upgraded roller rockers.

    Blueprint Pro Series Engines are dyno tested (dyno sheet included) and have a 30-Month/50,000-Mile Warranty. Your Blueprint Engine was tested with the components and specifications listed below. If you prefer to install different part(s), your engine may not produce the horsepower recorded on your dyno sheet.

    JEGS EZ Kits are designed by JEGS professionals to ensure that you get all the correct parts you need

    Can I replace my ls6 in my 04 car v with this motor?

    Asked by: 509CTSV
    Technically you can, but there is a good bit involved in this upgrade. Contact our tech department on a weekday and we can discuss all the requirements with Blueprint and give you an idea as to what all would be involved for your application.
    Answered by: Matt_B
    Date published: 2018-03-31

    I’m ls swapping my 1991 Ford f 150 I’d like to know everything that I will need to do so. Any help will be much appreciated. Thanks

    Asked by: Nick manzella
    It will physically fit, but will require a lot of fabrication and modification to make it work properly
    Answered by: Rusty B
    Date published: 2018-02-10

    Will this be a direct replacement for my LS1 2001 camaro?

    Asked by: 01ss
    This will bolt in and work with computer tuning necessary.
    Answered by: Jon Jegs Tech
    Date published: 2018-01-25

    2008 Escalade ESV AWD. Will I use my L92 parts when upgrading?balancer. 2200 converter still your suggestion for my daily driver? Any need to know info for my application?

    Asked by: LucasHodge82
    This is not designed for your application. The ECM would need to be changed as this engine does not support active fuel management.
    Answered by: Rusty B
    Date published: 2018-01-12

    Will my LS1 oil pan and valve covers fit this motor?

    Asked by: Surfinjoe
    Yes, your original parts should fit this engine.
    Answered by: Rusty B
    Date published: 2017-11-06

    What would I need to put this in my 05 c6 corvette, I know y'all said a 22 or better stall 

    Asked by: Da Q
    A stand alone ECU , a TCU for the transmission if you go with a higher than stock stall speed converter which it requires .Injectors, rails, throttle body, coil packs, valve covers, water pump, and oil pan for sure.
    Answered by: SteveM
    Date published: 2017-08-22
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    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations