Within its classic 427-cu-in displacement, engineers extracted Big-Block grunt from its high-revving Small-Block package. It features a unique, big-bore cylinder block that is anchored with a forged crankshaft, featherweight titanium connecting rods, and friction-coated pistons. But it's the airflow capability of the cavernous, CNC-ported heads that enables its tremendous power. Large-volume, straight-passage intake runners channel air directly through 2.20-inch titanium intake valves.

Chevrolet Performance's LS7 7.0L crate engine package includes a Corvette production-style engine with a dry-sump oil pan. You'll need to supply the external oil supply and oil lines to the engine, but the rest of the assembly is fully dressed, including the manifold assembly with injectors and electronically controlled throttle body, and log-style exhaust manifolds.

LS7 427ci / 7.0L TECH SPECS:

• Engine Type: LS-Series Gen IV Small-Block V-8
• Displacement: 427ci (7.0L)
• Bore x Stroke: 4.125' x 4.000' (104.8 x 101.6mm)
• Block: Cast-aluminum with six-bolt steel main bearing caps
• Crankshaft: Forged steel
• Connecting Rods: Forged titanium
• Pistons: Hypereutectic aluminum
• Camshaft Type: Hydraulic roller
• Camshaft Lift: .591' intake / .591' exhaust
• Camshaft Duration (@.050 in.): 211° intake / 230° exhaust
• Cylinder Heads: CNC ported LS7-style ports; 70-cc CNC combustion chambers
• Valve Size: 2.200' titanium intake / 1.610' sodium-filled exhaust
• Compression Ratio: 11.0:1
• Rocker Arms: Investment-cast, roller trunnion
• Rocker Arm Ratio: 1.8:1 (offset, intake only)
• Recommended Fuel: 91 octane (Minimum)
• Maximum Recommended rpm: 7000
• Reluctor Wheel: 58X
• Balanced: Internal

Notes:

• Not for Marine Use
• Assembly does not include any electronics
• LS7 Controller Kit - 809-19354334 available for non-Corvette applications. Kit includes electronic throttle pedal, which is required for throttle input to the ECU
• Comes assembled with 14-inch Corvette Z06 168-tooth flywheel
• LS7 is the same size and mounts the same as other LS-Series engines
• Use oil hose adapters - 809-25534412 to adapt to AN -12 fittings
• Intended for pre-1976 street vehicles or any off-road vehicle
• Use accessory drive kits - 809-19257325 without A/C or 809-19155067 with A/C

Requires:

• Dry sump oil lines
• Dry sump tank
• Engine processor
• Air filter/air box
• Accessory drive
• Engine control harness
• Engine control module
• Starter

  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.