LT5 6.2L Supercharged C7 ZR1 Crate Engine

The LT5 engine is a part of the Gen V LT-series engine family that features all-aluminum construction, variable valve timing, and direct injection technologies for the highest efficiency. An additional port injection system with eight injectors will complement the direct injection when the LT5 engine demands extra fuel. Additional features that aid in longevity is a dry-sump oil system, oil-spray piston cooling, and specific heavy-duty bearings.

LT5  Technical Specs

• Displacement: 6.2L/376 ci
• Horsepower: 755 @ 6400 rpm
• Torque: 715 ft.-lbs. @ 3600 rpm
• Bore: 4.065 in.
• Stroke: 3.622 in.
• Block: Cast aluminum with 6-bolt cross-bolted main caps
• Compression: 10:1
• Crankshaft: Forged steel
• Piston: Forged aluminum with polymer-coated skirts
• Rods: Forged powdered-metal steel
• Camshaft Type: Hydraulic roller with equal dual phasing
• Camshaft Duration (at .050 in.): 189-degrees intake / 223-degrees exhaust
• Valve Lift: .492 in. intake / .551 in. exhaust
• Intake Valve: 2.130 in. titanium
• Exhaust Valve: 1.590 in. sodium-filled
• Rocker Arm: 1.8:1 ration, roller bearing trunnion
• Supercharger: R2650 (2.65L) 11-rib belt
• Max Boost: 14 psi
• Throttle Body: 95 mm
• Max RPM: 6,600
• Fuel Type: Premium pump
• Fuel System: Direct injection (primary) w/ port injection (supplementary)

Notes:

• Includes engine oil cooler, 8-bolt flywheel
• Requires 72 psi fuel pressure and 45 gph
• Accessory drive not include (water pump and balancer included)

Engine Break-In Procedure

Use only engine oil that meets dexos1 specifications. For track events or competitive driving, use Mobil 1 15W-50 engine oil. Fill the engine with oil and follow the proper engine priming procedure.  Also check and fill as required any other necessary fluids such as coolant, power steering fluid, etc.

Start the engine and listen for any unusual noises. If no unusual noises are noted, run the engine at approximately 1000 RPM until normal operating temperature is reached.  The engine should be driven at varying loads and conditions for the first 30 miles or one hour without wide open throttle (WOT) or sustained high RPM accelerations.  Run five or six medium throttle (50%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear. Run two or three hard throttle (WOT 100%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear. 

Change the engine oil and filter. Inspect the oil and the oil filter for any foreign particles to ensure that the engine is functioning properly.  Drive the next 500 miles (12 to 15 engine hours) under normal conditions. Do not run the engine at its maximum rated engine speed. Also, do not expose the engine to extended periods of high load.  Change the oil and filter again, inspect the oil and oil filter for any foreign particles to ensure that the engine is functioning properly.