The BluePrint Engines GM LS Compatible 427 C.I. Builder Series Engine & TKX 5-Speed Manual Transmission Package combines big-cubic-inch LS performance with the durability and crisp shifting of the Tremec TKX 5-speed manual transmission. Producing 585 horsepower and 520 ft.-lbs. of torque, this turnkey drivetrain package is engineered for muscle cars, pro touring builds, street rods, and custom LS swap projects looking for modern reliability with the engaging feel of a manual transmission.

The 427 C.I. Builder Series engine is built around BluePrint's high-strength LS-compatible cast iron block and features BluePrint LS3 aluminum cylinder heads, a forged 4340 steel crankshaft, forged connecting rods, forged pistons, and a hydraulic roller camshaft designed to deliver exceptional low-end torque with impressive top-end power. Fuel and ignition are controlled by the included Holley Terminator X Max Gen IV EFI System, featuring a factory-calibrated ECU, complete engine wiring harness, handheld programmer, sensors, and wideband oxygen sensor for simplified installation and outstanding drivability.

The drivetrain ships with the engine and Tremec TKX transmission factory assembled, complete with a McLeod clutch package, billet flywheel, bellhousing, starter, and engine guard, providing a professionally matched package that's ready for installation into your next performance build.

Key Features:

• 427 C.I. GM LS Compatible Builder Series Engine
• 585 Horsepower / 520 ft.-lbs. Torque
• Tremec TKX 5-Speed Manual Transmission
• Standard Edition Builder Series
• Holley Terminator X Max Gen IV EFI System
• BluePrint High-Strength Cast Iron LS Block
• BluePrint LS3 Aluminum Cylinder Heads
• 11.0:1 Compression Ratio
• Hydraulic Roller Camshaft
  • .625" Intake Lift
  • .625" Exhaust Lift
  • 236° Intake Duration @ .050"
  • 242° Exhaust Duration @ .050"
  • 113° Lobe Separation Angle
• Forged 4340 Steel Crankshaft
• Forged H-Beam Connecting Rods
• Forged Aluminum Pistons
• LS3 Intake Manifold
• Drive-by-Wire Throttle Body
• Fuel Rails & Injectors Included
• Coil Packs, Spark Plugs & Wires Included
• Low Profile Rear Sump Oil Pan
• Premium 91+ Octane Fuel Recommended
• Dyno Tested by BluePrint Engines

Transmission Package Includes:

• Tremec TKX 5-Speed Manual Transmission
• McLeod Performance Clutch Kit
• Billet Steel Flywheel
• Bellhousing
• Starter
• Engine Guard
• Hydraulic Release Bearing

Gear Ratios:

• 1st: 2.87:1
• 2nd: 1.89:1
• 3rd: 1.28:1
• 4th: 1.00:1
• 5th: 0.68:1

Fitment Applications:

Designed for custom GM LS-powered vehicles including:

• Chevrolet Camaro
• Pontiac Firebird
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet Corvette
• Chevrolet C10 Trucks
• Chevrolet El Camino
• GM G-Body Vehicles
• Street Rods
• Pro Touring Builds
• Custom Performance Vehicles

Note: Verify engine mounts, transmission tunnel clearance, clutch hydraulics, driveshaft length, crossmember, cooling system, and accessory compatibility before installation.

Installation Notes:

• Ships with the engine and TKX transmission factory assembled.
• Includes a Holley Terminator X Max EFI System with BluePrint factory calibration.
• Do not overwrite the supplied ECU calibration using the standard Holley setup procedure.
• Standard Edition configuration does not include a front accessory drive.
• BluePrint recommends using the specified intake system to maintain proper MAF calibration and preserve factory tuning.
• Premium 91+ octane fuel is recommended.
• Verify clutch hydraulic system, transmission crossmember, and driveshaft fitment before installation.