We are experiencing longer than normal build times due to parts and shipping delays, please contact us through live chat for accurate lead times.

427CI LS Stroker Crate Engine | GM LS Style | Longblock | Aluminum Heads | Roller Cam | Late Model Drop In Upgrade

$9,299.00

Part #: PSLS4271CT

Description

  • HP & Torque: 625 HP / 550 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

Warranty:

  • 30 month / 50,000 mile

Notes:

  • This engine requires a non-weighted harmonic balancer, and non-weighted flexplate/flywheel.
    This engine is specifically designed to replace your existing LS engine - a direct drop in 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.
Factory Wet Sump LS3 Install
2009-2015 CAMARO SS w/Manual Trans
2008-2013 Corvette w/ Wet Sump
2015-2017 SS With Manual Trans
Install: This engine will install in a similar manner to a factory replacement longblock engine, reusing factory components from your existing LS3. It WILL require Professional Level Dyno Tuning.
Utilize your factory Throttle body, injectors, fuel rail, oil pan and pickup, front accessory components, sensors wiring, valve covers, ETC.
Does NOT work in Dry Sump Corvettes
Recommend a 2200+ Stall converter
This is NOT an L99. If your camaro/ss is an automatic. You will have additional Tuning and wiring to eliminate AFM and/or VCT.

 

Factory Wet Sump LS1/LS2 Install
2002-2007 Corvette w/ Wet Sump
1998-2002 Camaro/Firebird
2005-2006 Chevrolet SSR
2005-2006 Pontiac GTO
2006-2009 Chevrolet TrailBlazer SS (With aftermarket intake change only)
2006-2007 Cadillac CTS-V
Install: This engine should be considered an expert level, performance upgrade to your exiting LS1 / LS2.  You will reuse some existing factory equipment, while upgrading/replacing other items with "LS3" Type.
WILL require Professional Level Dyno Tuning, Custom wiring, and install. 
We recommend you Utilize your factory Throttle body, oil pan and pickup, front accessory components, valve covers, coils.
Your install will require PCV Rerouting, Throttle body adapter, wiring considerations, LS3 Injectors/rail, 24x to 58X signal converter box (For LS1 and Early LS2). Probable OEM sensor wire extension.
Does NOT work in Dry Sump Corvettes
Recommend a 2200+ Stall converter

 

Part #: PSLS4271CT

Description

  • HP & Torque: 625 HP / 550 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

Warranty:

  • 30 month / 50,000 mile

Notes:

  • This engine requires a non-weighted harmonic balancer, and non-weighted flexplate/flywheel.
    This engine is specifically designed to replace your existing LS engine - a direct drop in 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.
Factory Wet Sump LS3 Install
2009-2015 CAMARO SS w/Manual Trans
2008-2013 Corvette w/ Wet Sump
2015-2017 SS With Manual Trans
Install: This engine will install in a similar manner to a factory replacement longblock engine, reusing factory components from your existing LS3. It WILL require Professional Level Dyno Tuning.
Utilize your factory Throttle body, injectors, fuel rail, oil pan and pickup, front accessory components, sensors wiring, valve covers, ETC.
Does NOT work in Dry Sump Corvettes
Recommend a 2200+ Stall converter
This is NOT an L99. If your camaro/ss is an automatic. You will have additional Tuning and wiring to eliminate AFM and/or VCT.

 

Factory Wet Sump LS1/LS2 Install
2002-2007 Corvette w/ Wet Sump
1998-2002 Camaro/Firebird
2005-2006 Chevrolet SSR
2005-2006 Pontiac GTO
2006-2009 Chevrolet TrailBlazer SS (With aftermarket intake change only)
2006-2007 Cadillac CTS-V
Install: This engine should be considered an expert level, performance upgrade to your exiting LS1 / LS2.  You will reuse some existing factory equipment, while upgrading/replacing other items with "LS3" Type.
WILL require Professional Level Dyno Tuning, Custom wiring, and install. 
We recommend you Utilize your factory Throttle body, oil pan and pickup, front accessory components, valve covers, coils.
Your install will require PCV Rerouting, Throttle body adapter, wiring considerations, LS3 Injectors/rail, 24x to 58X signal converter box (For LS1 and Early LS2). Probable OEM sensor wire extension.
Does NOT work in Dry Sump Corvettes
Recommend a 2200+ Stall converter

 

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.

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

PSLS4271CT Recommended Parts
  • BluePrint Engines 10w30 Engine Oil - 1 Quart

    BPP10W30

    $8.95

  • GM Gen IV LS OIL FILTER

    BPPB160

    $12.95

  • ALUMINUM | GM LS Corvette Spacing | WATER PUMP

    BPPLS126WP

    $148.95

  • GM LS 45 DEG WATER NECK

    BPP893745

    $51.95

  • GM LS STRAIGHT WATER NECK

    BPP8938S

    $51.95

  • LS CHEVY| LS 6-BOLT CRANK | LS SERIES 168T FLYWHEEL

    BPPLS1611

    $299.95

  • STARTER | GM LSX | DELCO STYLE |

    BPP9101BK

    $155.95

  • LS FRONT ACCESSORY DRIVE | FULL SERPENTINE W/ ALT | PS | WP | AC | BRACKETS | BOLTS

    BPPLSFDACPSBK

    $1,899.00

  • LS FRONT ACCESSORY DRIVE | FULL SERPENTINE W/ ALT | PS | WP | BRACKETS | BOLTS

    BPPLSFDPSBK

    $1,849.00

  • LS FRONT ACCESSORY DRIVE | FULL SERPENTINE W/ ALT | AC | WP | BRACKETS | BOLTS

    BPPLSFDacBK

    $1,849.00

  • Keep Calm And Do a Burnout Black T-Shirt

    BPM01KC-SM

    $25.00

  • Black BluePrint Flag T-Shirt

    BPM01FGB-SM

    $25.00

  • BluePrint Engines Stroke It T-shirt

    $27.00

  • LS Firing order T-shirt

    BPM01LS

    $27.00

  • Check Out This Product and More On Our Pinterest Page