Breakdown of Included Items

LS427 / 7.0L Crate Engine

LS427 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. Based on the production LS7 with a more aggressive camshaft and a swap friendly wet-sump oil setup.

LS427 Engine Specs

• 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
• 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

Supermatic 4L75-E Transmission

Developed by Chevrolet Performance engineers, the 4L75-E Supermatic has been proven, in real-world conditions, to be one of the most robust automatic transmissions on the market. The Supermatic 4L75-E is the size of the 4L65-E transmission so it's smaller than the 4L80-E but offers more torque capacity than comparably sized transmissions. The 650 lb.-ft. torque capacity makes it the flexible alternative to the 4L80-E when transmission tunnel clearance is an issue.

4L75-E SuperMatic Features:

• Four-Speed Automatic
• 3000-3400 Stall Converter
• Features 5-pinion gear sets
• Heat-treated stator shaft splines
• Induction-hardened turbine shaft
• Specific valve-body calibration
• Unique, high-strength input housing
• Higher-capacity servo
• More robust 3-4 clutch
• Larger 2-4 band
• Based on the 4L65-E/4L70-E

4L75-E SuperMatic Gear Ratios:

• 1st: 3.06:1
• 2nd: 1.62:1
• 3rd: 1.00:1
• 4th: 0.70:1

Engine Control Module and Harness

A precisely calibrated engine control module is essential to making your modern fuel-injected engine perform in your older vehicle.  Unlike production controllers that may or may not come with a used engine, these controllers are calibrated for installation in older vehicles. That means many of the features required for late-model production vehicles are "turned off," because they're not required in older cars and trucks. That means features that may trigger a diagnostic trouble code and possibly affect performance - requiring additional tuning - are not enabled. These controller kits deliver all the components required to plug into the engine and get it running - from the controller itself and the accompanying wire harness to the mass airflow sensor, oxygen sensors, and even a throttle pedal assembly. The kits also include detailed instructions to help you do it right the first time, even if you have no experience.

INSTALLATION NOTES:

• Assembly does not include accessory drive kit
• LS427 is the same size and mounts the same as other LS-Series engines
• Intended for pre-1976 street vehicles or any off-road vehicle
• Transmission requires DEXRON VI fluid

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