**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:

BluePrint Motorsports introduces the ultimate 427ci LS Chevy-compatible long block, purpose-built for maximum boosted horsepower. Whether you’re chasing wins on the drag strip, sliding through drift circuits, tackling off-road trails, or carving up autocross courses, this engine delivers the perfect blend of power and reliability. At its foundation is a high-strength LSX-style cast-iron block, designed to handle extreme boost from nitrous, superchargers, or turbos. Topping it off are BluePrint Engines LS3 aluminum heads, paired with a BluePrint hydraulic roller cam for optimized airflow and performance across the powerband. Inside, a forged 8cwt crankshaft and forged H-beam rods provide rock-solid strength, while Mahle 2618 custom forged pistons ensure unmatched durability under pressure.

Description: 

• Horsepower & Torque: 585 Horsepower / 540 ft. lbs. Torque
• Compression Ratio: 9.5:1
• BluePrint Engines LS3 Aluminum Heads
• BluePrint Engines Hydraulic Roller Cam
  
• BluePrint Engines Forged Crankshaft
• Mahle 2618 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 studded mains
  
• Billet Main Caps

Rotating Assembly:

• Forged 8cwt Crankshaft
• 4.125" Stroke
• Forged H-Beam 6.125" Connecting Rods
• Mahle Custom 2618 Forged Pistons
• Internally Balanced Front and Rear

Cylinder Heads:

• BluePrint Aluminum Cylinder Heads -PS8020
• LSX Style 6 Bolt Studded Heads
• 70cc Chamber
• 2.165" Intake / 1.600" Exhaust Valves
• 259cc Intake / 102cc Exhaust Runners

Cam Specs:

• Hydraulic Roller
• .641 intake / .641 Exhaust Lift
• 236 Intake / 256 Exhaust Duration
• @.050-115.5 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.