BluePrint BPLS3640CTC GM LS 6.0L 400 HP Carbureted LB Long Block Crate Engine

Description

During high RPM track day lap sessions, the BluePrint BPLS3640CTC Crate Engine runs strong with consistent oil pressure and snappy acceleration. Displacing 6.0 liters across 364 cubic inches, this carbureted LS motor outputs 400 horsepower at 5800 RPM and 415 lb-ft torque at 4400 RPM. A single plane intake manifold, four barrel carburetor, and smart ignition box combine classic tuning with LS valvetrain design.

Solid cast iron block casting features heavy cylinder walls anchored by six bolt cross bolted main caps. The reciprocating kit contains a cast iron 3.622 inch stroke crankshaft, 6.098 inch connecting rods, and hypereutectic pistons inside 4.000 inch bores. The resulting 10.2:1 compression ratio operates on 91 octane pump gasoline. Total wet sump capacity holds six quarts, bringing dressed dry weight to 480 lbs.

Key Features of BluePrint BPLS3640CTC

Buy BluePrint BPLS3640CTC crate engine configurations to combine modern LS engine architecture with simple carburetor tuning. The dressed package pairs high flow cathedral port aluminum cylinder heads with a tuned four barrel carburetor for immediate track readiness.

• 750 CFM four barrel electric choke carburetor meters air and fuel for sharp throttle transitions.
• Single plane aluminum intake manifold maximizes cylinder charging throughout upper rev limits.
• Cathedral port aluminum cylinder heads drop dead chassis weight while resisting high temperature detonation.
• Stand alone ignition control box operates individual coil packs without requiring complete vehicle EFI wiring.
• BluePrint BPLS3640CTC valvetrain parts feature roller rocker arms to eliminate side load friction on valve stems.
• Six bolt cross bolted iron main caps eliminate crank journal flex under elevated track RPM loads.
• Hydraulic roller camshaft profile creates sharp valve events without valve float at 6200 RPM.

Carbureted LS Engine Dyno Metrics

Engine dyno records confirm this motor generates 400 brake horsepower at 5800 RPM and 415 lb-ft torque at 4400 RPM across a wide 2200 to 6200 RPM operating band. Cam duration measures 218 degrees intake and 224 degrees exhaust at 0.050 inch lift, producing 0.540 inch intake and 0.540 inch exhaust lift. The engine draws 15 in-Hg vacuum at 800 RPM on 91 octane fuel, maintaining 45 to 60 PSI hot oil pressure.

Engine Bay Envelope Drivetrain Pairing

Standard GM LS dimensions drop straight into vintage muscle car subframes using conversion motor mount plates. The crankshaft utilizes an internal neutral balance flexplate or flywheel matched to standard GM automatic or manual transmission bellhousings. Low profile intake components clear factory hood lines, while the retrofit oil pan clears intermediate steering linkages.

Roller Camshaft Break In Protocols

Pressurize the engine oiling channels with a pre lube tank prior to turning the starter key to safeguard crank and cam bearings. This competition crate engine is not engineered for marine bilge setups, forced induction boost exceeding six PSI on stock ring end gaps, or unmetered nitrous oxide systems.

• Drain break in oil and replace the spin on lube filter after the first 500 operating miles.
• Perform regular motor oil changes every 3000 miles or six months with high zinc synthetic oil.
• Inspect carburetor float adjustments and verify ignition timing advance every 6000 street miles.

Verified Dyno Sheet Warranty Terms

Protection includes a 30-Month / 50,000-Mile factory limited warranty guarding against defective components. The shipment crate contains the dressed long block, carburetor, intake manifold, ignition control module, coil packs, spark wires, oil pan, valve covers, and an official dynamometer run sheet.