The BluePrint Engines GM LS Compatible 376 C.I. Truck Edition Builder Series Engine & 4L65/70E Automatic Transmission Package brings modern LS performance and 4WD capability to classic trucks and off-road builds. Delivering 510 horsepower and 440 ft.-lbs. of torque, this complete drivetrain package is engineered for truck applications requiring dependable power, smooth drivability, and electronic fuel injection performance.

Designed for 1/2-ton 4WD truck applications, this package pairs BluePrint's proven 376 C.I. LS-compatible engine with a 4WD-ready 4L65/70E automatic transmission featuring a 27-spline 4WD output shaft. The included Holley Terminator X Max Gen IV EFI System provides precise fuel and spark management with a complete ECU, harness, sensors, and BluePrint calibration for quick starts, smooth operation, and reliable performance.

The engine features a 10.7:1 compression ratio, BluePrint aluminum cylinder heads, hypereutectic pistons, nodular iron crankshaft, hydraulic roller camshaft, cast aluminum intake manifold, and LS swap oil pan for a simplified installation. The drivetrain package ships assembled and is ideal for truck builds that need modern LS efficiency without sacrificing traditional truck capability.

The BLS37684X4 Truck Edition Builder Series is designed for builders looking to upgrade classic Chevrolet and GMC trucks with reliable LS power, electronic fuel injection, and 4WD compatibility.

Key Features:

• 376 C.I. GM LS Compatible Truck Edition Engine
• 510 Horsepower / 440 ft.-lbs. Torque
• 4L65/70E Automatic Transmission Package
• 4WD Ready Transmission Case
• 27-Spline 4WD Output Shaft
• Standard Truck Edition Builder Series
• Holley Terminator X Max Gen IV EFI System
• Complete ECU & Engine Harness
• BluePrint Calibrated EFI System
• BluePrint Aluminum Cylinder Heads
• 10.7:1 Compression Ratio
• Hydraulic Roller Camshaft:
  • .553" Intake Lift
  • .553" Exhaust Lift
  • 218° Intake Duration @ .050"
  • 224° Exhaust Duration @ .050"
  • 113° Lobe Separation Angle
• Hypereutectic Pistons
• Nodular Iron Crankshaft
• 3.622" Stroke
• 6.098" Connecting Rods
• Cast Aluminum Intake Manifold
• Drive-by-Wire Throttle Body
• Fuel Rails & Injectors Included
• Coil Packs, Spark Plugs & Wires Included
• Low Profile LS Swap Oil Pan
• Harmonic Balancer
• Water Pump Included
• No Front Accessory Drive Included

Transmission Package Includes:

• GM 4L65/70E Automatic Transmission
• 4WD Ready Case
• 27-Spline 4WD Output Shaft
• Electronic Transmission Controller
• 2200-2400 RPM Stall Torque Converter
• Flexplate
• Starter

Transmission Notes:

• Does not include transfer case
• Uses common 4L60/70 six-bolt transfer case mounting pattern
• Designed for light-duty truck and 4WD applications

Fitment Applications:

Ideal for:

• Chevrolet C10 / K10 Truck Builds
• GMC C/K Truck Builds
• Square Body Chevrolet Trucks
• Classic 4x4 Truck Restomods
• Off-Road Street Trucks
• Pro Touring Truck Builds
• Custom LS Swap Applications

Recommended Application:

• 1/2-ton 4WD pickups
• 3.90 or numerically higher rear gearing
• Up to approximately 33-inch tires
• Light towing applications

Installation Notes:

• Engine and transmission package ships fully assembled.
• Requires compatible transfer case (not included).
• The Holley Terminator X Max ECU is pre-calibrated by BluePrint Engines. Do not follow standard Holley setup procedures that overwrite the supplied calibration.
• Front accessory drive is not included.
• Verify accessory clearance, motor mounts, transmission crossmember, driveshaft length, cooling system, and transfer case compatibility before installation.
• Not intended for heavy-duty towing applications.