Description
L8T Long Block Chevrolet Performance LT-Series Crate Engine
401hp @ 5,200 rpm
464 lb.-ft. @ 4,000 rpm
NOTE: Refer to catalog for the complete
horsepower and torque testing procedures.
LONG BLOCK
Chevrolet Performance offers the L8T Long
Block – the high-output, direct-injected foundation of the Gen V Small-Block-based 6.6L
engine offered in the Silverado 2500HD and 3500HD models.
Our L8T Long Block includes the direct injection cylinder heads and coil-on-plug ignition
system, as well as the oil pan with dipstick, but does not include the intake manifold,
throttle body, engine-mounted high-pressure direct injection fuel pump or fuel injectors.
All must be sourced separately to complete the engine assembly. Additionally, the Front
End Accessory Drive system is not included. See Installation Notes for recommendations.
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.
Chevrolet Performance L8T Long Block Crate Engine 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. See page 107 for options. - Includes 8-bolt flexplate for automatic transmissions
- 2024+ use for 6L80-E transmission. Use Engine
Control kit 19435606 for 10L90-E transmission. See catalog for details. - Available in Connect & Cruise with 6L80 and 10L90 transmission options
Mobil 1 is the recommended engine oil for all Chevrolet Performance Engines
Chevrolet Performance Crate Engines include a 24-month
or 50,000-mile/80,000-kilometer limited warranty, whichever
comes first. See your GM dealer for details.
Chevrolet Performance does not utilize any used or
remanufactured parts in this crate engine, except for
the starter, alternator and power steering pump
This part is intended for competition use only.
See page 2 of catalog for complete details
| TECH SPECS | Part Number: 19433750 |
| Engine Type: | Gen V Small Block V-8 direct injection spark ignition |
| Displacement (cu in): | 400 (6.6L) |
| Bore x Stroke (in): | 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 (@.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: | 5,600 |
| Reluctor Wheel: | 58x |
| Balanced: | Internal |
