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Horsepower: 401 HP

Torque: 464 LB-FT

Heavy-Duty Power from Chevy's HD Trucks

With 401 horsepower and 464 lb.-ft. of torque on tap, the L8T crate engine is the largest-displacement LT-family engine in our lineup, offering plenty of low-rpm torque. Direct injection offers more precise fuel control than port injection, enabling a comparatively high compression ratio of 10.8:1 in the engine, which contributes to its high output.

It’s built with a forged steel crankshaft and other high-strength parts. Additional features such as oil-spray cooling for the pistons and a cast iron, long-skirt cylinder block with six-bolt, cross-bolted main caps contribute to the engine’s strength and durability. Comes with production style exhaust manifolds.

Our L8T crate engine package comes complete from the throttle body to the oil pan, including the PCV tube, evap tube, oil dipstick and oil fill tube and cap. It does not include the controller, harness, oxygen sensors or a Front End Accessory Drive system. See Installation Notes below for recommendations.

INSTALLATION NOTES

• Engine is shipped with high-pressure direct-injection fuel pump installed
• Front End Accessory Drive system must be ordered separately and includes hydraulic power steering, with center pulley. Pulley-mounted fan not recommended. 
• Includes 8-bolt flexplate for automatic transmissions
• 2024+ use with Engine Control kit 19435726 for 6L80-E transmission. Use Engine Control kit 19435606 for 10L90-E transmission. 
• Available in Connect & Cruise with 6L80 and 10L90 transmission options

TECH SPECS

• Part Number: 19435733 (2024+)
• Engine Type: Gen V Small Block V-8 direct injection spark ignition
• Displacement (cu in): 400 (6.6L)
• Bore x Stroke (in / mm): 4.065 x 3.860 (103.25 mm x 98 mm)
• Block (P/N 19420904): Cast iron with 6-bolt nodular main bearing caps
• Crankshaft (P/N 12708884): Forged steel
• Connecting Rods (P/N 12675746): Forged powder-metal
• Pistons (P/N 12699527-R, 12699529-L): Hypereutectic aluminum
• Camshaft Type (P/N 12672469): Billet steel hydraulic roller
• Valve Lift (in): 0.500 intake / 0.492 exhaust
• Camshaft Duration (@ 0.050 in): 193º intake / 199º exhaust
• Cylinder Heads (P/N 12703610): Aluminum rectangular port D/I with 59.02cc chambers
• Valve Size (in): 2.130 hollow intake / 1.590 inconel exhaust
• Compression Ratio: 10.8:1
• Rocker Arms (P/N 12619829): Investment cast roller trunnion
• Rocker Arm Ratio: 1.8:1
• Intake manifold (P/N 12639087): Composite
• Throttle body (P/N 12730580): 87mm diameter (single-bore)
• Fuel delivery: High-pressure direct injection (2,175 psi / 150 bar)
• Recommended Fuel: 87 octane
• Ignition system: Coil-on-plug
• Maximum Recommended RPM: 5600 rpm
• Reluctor wheel: 58X
• Balanced: Internal