GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected
GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected

GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected

SKU: BLS427K4L7

GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission - 625 Horsepower - Standard Edition Builder Series with Polished Pulley Kit - Fuel Injected

SKU: BLS427K4L7

HP & Torque: 625 HP / 565 FT. LBS

Cylinder Heads: BluePrint Engines 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

Pistons: Forged

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

/
  • Secure payments
  • Financing available at checkout with Affirm

Description:

  • Horsepower & Torque: 625 Horsepower / 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
  • 4.0685" Bored
  • 1-Piece Rear Main Seal

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

Also Includes:

  • Drive by Wire Throttle Body
  • LS3 Intake Manifold
  • 42# Injectors and Returnless Fuel Rail
  • Harmonic Balancer
  • Valve Covers, Retro Fit Oil Pan and Timing Cover
  • Coil Packs
  • Spark Plug and Wires
  • Wiring Harness
  • Gas Pedal
  • Front Accessory Drive with Alternator, A/C Compressor, Power Steering Pump, and Water Pump

Assembled with Complete Performance Built 4l65/70e Four Speed Automatic Transmission Package:

  • 4L65/70E Complete Package
  • Electronic Transmission Controller Included
  • 2200-2400 Stall Torque Converter
  • Flex Plate
  • Starter

Notes:

  • 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.
  • The front accessory drive on this engine fits many vehicles, however it is the customer responsibility to accurately measure and confirm fitment.  Note this is a low-profile design, but things such as power steering hoses, alternator wiring, and additional fittings/fabrication may be required on some vehicles.
  • The Included LS controller package is for engine control only. Does not contain any transmission or body control. The ECU comes with calibration that is optimal for our engine, however, please note that vehicle parameters such as gearing, tire size, vehicle weight, air intake, headers, etc. may necessitate additional tuning once installed into your specific vehicle. The included ECU is unlocked for further refinement at your local dyno shop if required.
  • 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: BLS427K4L7

Fuel Delivery Type: Electronic 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 Car

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 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.

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
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
Holley EFI In-Tank Retrofit Fuel Pump - 450 LPH - Return Style
BluePrint Parts – GM LS Compatible Water Neck – 45°
BluePrint Parts – GM LS Compatible Water Neck – Straight