BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block
BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block

BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block

SKU: BPMS427LS

BluePrint Motorsports GM LS Compatible 427 c.i. Pro Series Engine - Naturally Aspirated - Long Block

SKU: BPMS427LS

Horsepower & Torque: 638 Horsepower / 540 ft. lbs. Torque

Cylinder Heads: BluePrint Engines LS3 Aluminum Cylinder Heads

Compression Ratio: 11:1

Camshaft: Hydraulic Roller Cam - .646 Intake / .646 Exhaust Lift and 254 Intake / 266 Exhaust Duration @.050-113° LSA - Three Bolt Cam

Pistons: Mahle 4032 Custom Forged

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

This engine Does NOT come with a Fuel Injection ECU and Wiring Harness.

Requires Race Fuel of 100+ Octane

/
  • Secure payments
  • Financing available at checkout with Affirm

**BluePrint Motorsports engines are built for maximum performance and are intended for extreme duty race applications. If this engine is used in a street application our normal 30 month, 50,000-mile warranty applies, if used in sanctioned racing no warranty, expressed, or implied.

Overview:

The LS-compatible platform is the king of street machines—and this BluePrint Engines 427 c.i. Pro Series monster proves why. Unleash raw, LS-powered fury with a street-scorching 638 horsepower and 540 ft-lbs of torque. This beast has BluePrint aluminum heads, a hydraulic roller cam, and hypereutectic pistons, and forged crankshaft, all locked into a high-strength LSX-style cast iron block. 

Description: 

  • Horsepower & Torque: 638 Horsepower / 540 ft. lbs. Torque
  • Compression Ratio: 11:1
  • BluePrint Engines LS3 Aluminum Heads
  • BluePrint Engines Hydraulic Roller Cam
  • BluePrint Engines Forged Crankshaft
  • Mahle 4032 Custom Forged Pistons

Block:

  • BluePrint Engines High Strength Cast Iron (LSX Style) Block 
  • Increased Deck Thickness and Strength Webbing
  • Utilizes OEM LS3 Front and Rear Covers
  • Improved Water Jacket Design
  • Extended Cylinder Skirt
  • 1-piece Rear Main Seal
  • Priority Main Oiling
  • 4.0695" Bore
  • 6-bolt Main

Rotating Assembly:

  • Forged Crankshaft
  • 4.125" Stroke
  • Forged 6.125" Connecting Rods
  • Mahle Custom 4032 Forged Pistons
  • Internally Balanced Front and Rear

Cylinder Heads:

  • BluePrint Aluminum Cylinder Heads -PS8015
  • 70cc Chamber
  • 2.165" Intake / 1.600" Exhaust Valves
  • 259cc Intake / 102cc Exhaust Runners

Cam Specs:

  • Hydraulic Roller
  • .646 intake / .646 Exhaust Lift
  • 254 Intake / 266 Exhaust Duration
  • @.050-113 Degree Lobe Separation

Also Includes:

  • This engine does NOT come with a Fuel Injection ECU and Wiring Harness
  • Harmonic Balancer
  • Valve Covers
  • LS Swap Oil Pan
  • Timing Cover

Notes:

  • BluePrint Motorsports engines are built for maximum performance and are intended for extreme duty applications. Because of the high-stress nature of their use, these engines are sold without any warranty, expressed, or implied.
 

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: BPMS427LS

Fuel Delivery Type:

Spark Plug: CCH9405 (Not Included) Customer req to adjust heat range/gap per their fuel type and aspiration.

Spark Plug Gap: .045"

Harmonic Balancer: Non-Weighted

Flexplate/Flywheel: Non-Weighted

Stall Converter: Customer should match engine output and car setup to find best converter.

Intake Manifold: N/A

Fuel Recommendation: Requires Race Fuel of 100+ 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

Recommended Oil Filter: BPPB160

Recommended Break in Oil: BPP710

Recommended Oil: BPP10W30

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 10w30 Engine Oil - 1 Quart
BluePrint Engines Crate Engine Break-In 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 Fuel Pump and Plumbing Kit BPP5267 - For Fuel injected engines
BluePrint Engines EFI In-Tank Retrofit Fuel Pump - 450 LPH - Return Style
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
GM LSX Compatible Starter – Delco Style - OEM Finish
168-Tooth Steel Flex Plate - 1-Piece Rear Main Seal - OEM LS 1-Piece Balance - 4L60E/4L70E - GM LS Compatible
168-Tooth Nodular Iron Flywheel - 6-Bolt Crank - 11" or 12" Clutch - GM LS Compatible
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 LS Compatible Front Accessory Drive - Full Serpentine with Alternator | AC | Power Steering | Water Pump | Brackets and Bolts
GM LS Compatible Front Accessory Drive - Full Serpentine with Alternator | Power Steering | Water Pump | Brackets and Bolts
GM LS Compatible Front Accessory Drive - Full Serpentine with Alternator | AC | Water Pump | Brackets and Bolts
GM LS COMPATIBLE INTAKE MANIFOLD, BPE LOGO, LS3 / L92, ALUMINUM BLACK
BluePrint Engines 2009+ 87mm GM LS Compatible Drive By Wire Throttle Body. 12629992 equivalent
8.65mm Classic BluePrint Blue- Assembled Spark Plug Wire Set - 180° Boots - GM LS Compatible