Breakdown of Included Items

Emissions Legal LS3 6.2L Crate Engine

GM 6.2L LS3 engine features a durable aluminum cylinder block that houses a cast steel crankshaft and durable reciprocating parts. High-flow rectangle port cylinder heads feature a high flowing design for outstanding performance.

LS3 6.2L Engine Specs:

• Engine Type: LS-Series Gen IV Small-Block V-8
• Displacement: 376 ci (6.2L)
• Bore x Stroke: 4.065 x 3.622 in. (103.250 x 92 mm)
• Block: Cast-aluminum with six-bolt, cross-bolted main caps
• Crankshaft: Nodular iron
• Connecting Rods: Powdered metal
• Pistons: Hypereutectic aluminum
• Camshaft Type: Hydraulic roller
• Valve Lift: .551 in. intake / .522 in. exhaust
• Camshaft Duration (@.050 in.): 204-degree intake / 211-degree exhaust
• Cylinder Heads: L92 style port; 'as cast' with 68-cc chambers
• Valve Size: 2.165 in. intake / 1.590 in. exhaust
• Compression Ratio: 10.71
• Rocker Arms: Investment-cast, roller trunnion
• Rocker Arm Ratio: 1.7:1
• Recommended Fuel: 92 octane
• Maximum Recommended rpm: 6600
• Reluctor Wheel: 58X
• Balanced: Internal

Supermatic 4L70-E Transmission

Developed by Chevrolet Performance engineers, the 4L70-E Supermatic has been proven, in real-world conditions, to be one of the most robust automatic transmissions on the market. The Supermatic 4L70-E is the size of the proven 4L60-E transmission but offers more torque capacity than comparably sized transmissions. The 495 lb.-ft. torque capacity makes it the flexible alternative to the 4L80-E when transmission tunnel clearance is an issue.

4L70-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
• Seven-plate clutch

4L70-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
• LS3 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
• 6L80 does NOT include a transmission dipstick
• The specially calibrated engine controller does not engage a number of features associated with production-model systems, which eliminates the possibility of trouble codes. It also has an SES (service engine soon) LED indicator embedded in the fuse box.
• Includes a mid wet sump oil pan installed. This oil pan will ONLY fit 2010-2015 Camaro SS/ZL1, 2012-2017 Caprice PPV, 2014-2017 Chevy SS, 2008-2009 Pontiac G8 chassis. THIS INSTALLED OIL PAN WILL NOT WORK WITH MUSCLE CAR LS ENGINE SWAPS. OIL PAN CHANGE IS REQUIRED FOR MUSCLE CAR LS ENGINE SWAPS.

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

19421057K1 supersedes 19370414K1