BluePrint Engines BPLS3640CTC GM LS 6.0L 400 HP Carbureted LB

Description

Reluctor ring sensor misalignment and ignition ground float cause severe misfires on custom commercial retrofit trucks. The BluePrint Engines BPLS3640CTC GM LS 6.0L 400 HP Carbureted LB terminates ignition synchronizer errors during this commercial long block repower. This 8-Cylinder 400HP engine requires mechanical fuel pump pressure regulation checks before connecting fuel inlet lines.

Cast iron ASTM A48 Class 35 blocks house cross-bolted six-bolt main bearing caps for exceptional bottom-end stability. A nodular iron 3.622in stroke crankshaft connects to forged 4340 I-beam rods, hypereutectic pistons, and A356-T6 aluminum heads. This BluePrint Engines engine core requires a 12V 175A starter draw during cold starts. Dry weight is 465 lbs within a 28in length, 26in width, 27in height stance holding 5.5 quarts of oil.

Key Features of BluePrint Engines BPLS3640CTC

Hot rod builders buy BluePrint Engines BPLS3640CTC GM LS 6.0L 400 HP Carbureted LB packages to eliminate modern computer wiring headaches. Our industrial engine rebuild standard includes a dyno-matched single-plane aluminum intake manifold for smooth carburetor installation.

• Cylinder bores measure 4.000in with diamond plateau honed cross-hatch finishes.
• Main bearing journal clearance holds at 0.0016in across all six-bolt main saddles.
• Hydraulic roller camshaft profiles generate broad street power bands.
• Single-plane intake manifolds accept standard square-bore four-barrel carburetors.
• Multi layer steel head gaskets lock combustion pressures inside cylinders.
• This BPLS3640CTC commercial core receives dynamic balancing within two grams.
• Stellite valve faces maintain combustion seal under high sustained exhaust temperatures.

Brake Cell Dyno Numbers

Controlled brake cell testing verifies that this BPLS3640CTC long block engine produces 400 continuous BHP and 415 ft-lbs of torque at 4600 continuous load RPM. Internal oil gallery pressure measures 56 PSI while oil sump temp settles at 194°F under full throttle operation. Exhaust gas temp peaks at 1320°F down the test header tubes. Compression values register between 180 PSI and 188 PSI across all eight cylinders. Crankshaft center journal runout holds at 0.0002in TIR.

Field Assembly Setup Boundaries

Throttle linkage return mechanisms need 5 lbs of pull force to guarantee complete throttle plate closure at idle. This carbureted LS powerplant is not designed for electronic fuel injection swaps, closed marine engine compartments, or severe aircraft skids.

• Evacuate initial break-in engine oil and filter after 500 miles or 20 run hours.
• Inspect non-adjustable roller rocker arm bolt torque at 22 ft-lbs on base circle.
• Torque cylinder head bolts in three stages to final angle torque specifications.

Commercial Warranty Crate Package

The trusted BluePrint Engines assembly standard includes a 30-Month 50,000-mile limited parts warranty. The sturdy crate carries the long block engine, single-plane intake manifold, oil pan, front timing cover, aluminum valve covers, oil pickup tube, and signed dyno run sheet.