GM LS Compatible 427 c.i. ProSeries Engine - 625 Horsepower - Long Block
GM LS Compatible 427 c.i. ProSeries Engine - 625 Horsepower - Long Block

GM LS Compatible 427 c.i. ProSeries Engine - 625 Horsepower - Long Block

SKU: PSLS4271CT

GM LS Compatible 427 c.i. ProSeries Engine - 625 Horsepower - Long Block

SKU: PSLS4271CT

HP & Torque: 625 HP / 565 FT. LBS

Cylinder Heads: BluePrint Engines LS3 Aluminum Cylinder Heads

Compression Ratio: 11:1

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

Pistons: Forged

Crankshaft: Steel Crank - 4.125" Stroke and 6.125" Rods

Regular price $11,949.00
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Description:

  • HP & Torque: 625 HP / 565 FT LBS
  • Compression Ratio: 11:1
  • Aluminum Heads
  • Hydraulic Roller Cam
  • Forged Crank
  • Forged Pistons

Block:

  • OEM Block Machined in the USA!
  • 6-Bolt Main
  • 4.060" Bored to 4.069
  • 1-Piece Rear Main Seal

Rotating Assembly:

  • New Forged Crankshaft
  • 4.125" stroke
  • Forged 6.125" connecting rods
  • Forged Pistons
  • Internal

Cylinder Heads:

  • BluePrint Aluminum Cylinder Heads -PS8015
  • 72cc chamber
  • 2.165" intake/1.600" exhaust valves
  • 259cc intake/102cc exhaust runners

Cam Specs:

  • Cam Type: Roller
  • .624 intake .624 exhaust lift
  • 239 intake 255 exhaust duration
  • @ .050, 114-degree lobe sep.

Ignition Timing:

  • ECM Controlled (not included - customer must reprogram)

Also Includes:

  • Timing cover
  • LS3 Intake manifold

Notes:

  • This engine requires a non-weighted harmonic balancer, and non-weighted flex plate/flywheel.
  • This engine is specifically designed to replace your existing LS engine - a direct replacement for Gen 4 applications.
  • Built with a 58x Gen 4 style reluctor and sensors.
  • Not for use in pollution-controlled vehicles.
  • Recommended Fuel: 91 Octane
  • BluePrint Engines recommends a 2200+ RPM stall converter
  • Because this engine does not ship with an oil pan, we do not dyno test prior to the engine being shipped.
 

    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: PSLS4271CT

    Fuel Delivery Type: Fuel Injected

    Spark Plug: AC Delco 41-985

    Spark Plug Gap: .040"

    Harmonic Balancer: Non-Weighted

    Flexplate/Flywheel: Non-Weighted

    Stall Converter: 2200+

    Intake Manifold: LS3

    Fuel Recommendation: 91-93 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 This engine is specifically designed to replace your existing LS engine. Built with a 58x Gen 4 style reluctor and sensors, this engine is a drop in for Gen 4 applications.

    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.

    The satisfaction of our customers is our highest priority at BluePrint Engines. We use quality components to balance your engine's rotating assembly within two grams of spec. We dyno test your crate engine and certify that it's ready to deliver horsepower and torque.

    We give your BluePrint engine the industry's best-in-class warranty for 30-months / 50,000 miles — with the extra confidence only BluePrint can provide. Our warranty applies to individual or professional installations and is fully transferable.

    For a detailed overview of our warranty, 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
    $9.95
    BluePrint Engines 10w30 Engine Oil - 1 Quart
    $9.95
    TrueBlue Performance Octane Boost
    BluePrint Engines TrueBlue Performance Octane Booster
    $29.95
    BluePrint Engines TrueBlue UltraCool Antifreeze Coolant CONCENTRATE
    $19.95
    BluePrint Engines TrueBlue Power Steering Fluid
    $8.95
    BluePrint Engines TrueBlue Transmission Fluid UNIVERSAL ATF/MTF
    $9.95
    Gen IV LS and 2009+ Gen III Hemi Compatible Oil Filter
    $12.95
    EFI Fuel Pump Kit 526-7 - For Holley 550-510 and 550-511
    $499.95
    Holley EFI In-Tank Retrofit Fuel Pump - 450 LPH - Return Style
    $735.95
    EFI Billet Aluminum Fuel Pressure Bypass Regulator - 40-75 PSI and -10AN ORB - Black
    $109.95
    Liquid Filled Fuel Pressure Gauge - 0-100 PSI
    $18.99
    Muscle car swap LS, Air Intake Kit, with GM MAF
    $125.99
    Aluminum Water Pump – GM LS Corvette Spacing Compatible – Counter Clockwise - Natural
    $149.95
    GM LSX Compatible Starter – Delco Style - OEM Finish
    $155.95
    168-Tooth Steel Flex Plate - 1-Piece Rear Main Seal - OEM LS 1-Piece Balance - 4L60E/4L70E - GM LS Compatible
    $159.95
    168-Tooth Nodular Iron Flywheel - 6-Bolt Crank - 11" or 12" Clutch - GM LS Compatible
    $299.95
    BluePrint Parts – GM LS Compatible Water Neck – 45°
    $34.95
    BluePrint Parts – GM LS Compatible Water Neck – Straight
    $34.95
    GM LS Compatible Front Accessory Drive - Full Serpentine with Alternator | AC | Power Steering | Water Pump | Brackets and Bolts
    from $2,299.00
    GM LS Compatible Front Accessory Drive - Full Serpentine with Alternator | Power Steering | Water Pump | Brackets and Bolts
    from $2,149.00
    GM LS Compatible Front Accessory Drive - Full Serpentine with Alternator | AC | Water Pump | Brackets and Bolts
    from $2,149.00