Chervolet Performance L8T Long Block Crate Engine

In addition to the complete L8T crate engine Chevrolet Performance offers the L8T LongBlock — the high-output, direct-injected foundation of the Gen V Small-Block-based 6.6L engine offered in the Silverado 2500HD and 3500HD models.

Chevorlet Performances 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 (P/N 12639087), Throttle body (P/N 12730580), 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.

TECH SPECS

Engine Type: Gen V Small Block V-8 directinjection spark ignition
Displacement (cu in): 400 (6.6L)
Bore x Stroke (in / mm): 4.065 x 3.860 (103.25 mm x98 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