Engine Specifications

• Horsepower: 570 HP @ 6,200 RPM
• Torque: 540 ft.-lbs. @ 4,800 RPM
• Maximum Recommended RPM: 7,000 RPM
• Recommended Fuel: Premium pump

Block Information:

• Production LS7
• Cast aluminum
• 6-bolt main caps, cross-bolted
• Bore/Stroke: 4.125 in. x 4.000 in.  (101.600 mm x 92 mm)
• Displacement: 427 ci

Rotating Assembly:

• Crankshaft: Forged steel (809-12611649)
• Balance: Internal
• Rods: Forged titanium
• Compression Ratio: 11.0:1
• Pistons: Hypereutectic aluminum
• Flywheel from Manual transmission Camaro Z/28 14 in. 168-tooth

Camshaft Specs:

• Camshaft: Hydraulic roller
• Cam Duration @ .050 in.: Intake 227 / Exhaust 242
• Valve Lift: Intake .591 in. / Exhaust .590 in.
• Lobe Separation Angle: 116 degrees

Cylinder Head Information:

• Cylinder Heads: LS7 CNC-ported
• Combustion Chamber: 70 cc
• Valves: Intake 2.200 in. titanium / Exhaust 1.610 in. sodium-filled 
• Rocker Arms: 1.8:1 Ratio, cast aluminum with roller bearing trunnion (offset intake)

Oil Pan Information:

• Oil Pan: Attached is a 1998-2002 F-Body wet-sump aluminum oil pan, GM muscle car swap pan is included for a wider range of applications
• Oil Pump: Specific wet-sump oil pump

Intake Manifold:

• LS7 EFI low profile design
• Includes fuel rails, injectors, throttle body

Exhaust Manifold:

• Production Camaro Z/28 5th Gen
• Tri-y design
• Stainless steel

Assembled Long Block Includes

• Short Block
• Camshaft
• Timing Set
• Timing Cover
• Cylinder Heads
• Valve Covers
• Oil Pan
• Oil Pump and Pickup Tube
• Intake Manifold with Fuel Rails, Injectors, Throttle Body
• Water Pump
• Exhaust Manifolds
• Flywheel
• Harmonic Balancer
• Ignition Coils with Spark Plugs, and Plug Wires

Notes: 

• Intended for competition use only
• Not intended for marine applications

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.

GM Warranty Form

• Chevrolet Performance Crate Engines includes a 24-month or 50,000 mile limited warranty