L8P Crate Engine 523HP / 543 lb-ft

High-Performance 6.6L V8 Crate Engine

The L8P Crate Engine delivers an impressive 523 horsepower and 543 lb-ft of torque, making it an excellent choice for high-performance truck builds, muscle cars, restomods, and custom engine swap projects.

Built on GM’s advanced 6.6L V8 platform, this crate engine combines modern engineering, exceptional durability, and outstanding power for both street and performance applications.

Design to provide strong low-end torque and smooth power delivery, the L8P offers responsive acceleration, excellent towing capability, and dependable performance under demanding conditions.

Whether you’re replacing an existing engine or building a custom vehicle from the ground up, the L8P crate engine delivers the reliability and performance enthusiasts expect.

Key Features

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 12737834-R, 12737835-L):	Hypereutectic aluminum
Camshaft Type (P/N 12672469):	Billet steel hydraulic roller
Valve Lift (in):	0.549 intake / 0.549 exhaust
Camshaft Duration (@.050 in):	218º intake / 231º exhaust
Cylinder Heads (P/N 12736192):	Aluminum rectangular port D/I with 59.02cc chambers
Valve Size (in):	2.130 hollow intake / 1.590 sodium-filled 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:	Premium unleaded – 91 (R+M)/2
Ignition system:	Coil-on-plug
Maximum Recommended rpm:	6000 rpm
Reluctor Wheel:	58x
Balanced:	Internal