19433750 - L8T 6.6L 401 HP Long Block Engine by Chevrolet Performance  (pre-2024)

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.

INSTALLATION NOTES

Specifications:
Power: 401 HP @ 5200 RPM, 464 ft. lbs. of torque @ 4000 RPM
Displacement: 400 CID, 6.6L
Bore x Stroke: 4.060” x 3.860”
Compression Ratio: 10.8:1
Recommended Fuel: 87 Octane
Block: Cast Cast irong with 6 bolt cross bolted main caps
Crankshaft: 8-bolt Forged Steel
Connecting Rods: Forged Powdered Metal Steel
Pistons: Hypereutectic Aluminum
Camshaft: Billet Steel Hydraulic Roller Tappet
Cam Lift: .500” Intake / .492” exhaust
Cam Duration @ .050”: 193 deg. Intake / 199 deg. Exhaust
Lobe Separation: N/A
Cylinder Heads: Aluminum Rectangular Port, Direct Injected
Combustion Chamber: 59cc
Valves: 2.130” Intake/ 1.590” Exhaust
Rocker Arms: Cast Roller Trunnion, 1.81:1 Ratio
Balance: Internal
Reluctor: 58X
Maximum GM Recommended RPM: 5600

Engine Includes:
• Fully GM assembled long block
• Ignition Coils
• Oil pump, pick-up and wet sump oil pan
• Harmonic Balancer
• Front timing cover
• Passenger Side RH Oil Dipstick and Tube

Warranty:
General Motors limited 2 year / 50,000 mile parts & labor warranty. Click on Document tab above for full details.