• Not designed for late model applications that were originally equipped with factory fuel injection
• Not for EGR

Recommended Stall Converter: 2200+ RPM 
Recommended Fuel: 91-93 Octane

Rotating Assembly

• Nodular Iron Crankshaft: 3.622 in. Stroke
• Forged Connecting Rods: 6.098 in.
• Hypereutectic Pistons
• 10.7:1 Compression
• Internally Balanced (Balancer Included) 

Cylinder Heads

• LS3 Aluminum
• Combustion Chamber: 68 cc
• Intake Valve: 2.165 in.
• Exhaust Valve: 1.600 in.

Camshaft Specs

• Hydraulic Roller
• Duration at .050 in. Lift: 225 Intake, 238 Exhaust
• Lift: .612 in. Intake, .585 in. Exhaust
• Lobe Separation: 113 Degrees 

Other Features

• GM LS3 Intake Manifold, fuel rails, injectors
• Drive By Wire throttle body
• GM Hot Rod universal oil pan
• AC Delco coil packs and plug wires
• Firing Order: 1-8-7-2-6-5-4-3
• ACDelco 41-985 spark plugs (.040 in. Gap)
• Includes coil packs, coil wiring harness, crank, cam, coolant, knock, oil pressure, and map sensors

Engine Break-In Procedure

Use or break-in oil or conventional (non-synthetic) multi-viscosity oil with zinc additive for the first 500 miles of operation. Avoid hard acceleration for sustained periods. Periodically change the engine speed while driving to help seat the rings. While the engine is running, be sure to check oil pressure and coolant temperature, and check for fluid leaks, such as oil, transmission fluid, fuel, and coolant/antifreeze. Also listen for any unusual sounds. Should you hear an unusual sound, shut the engine off, check for the source, and correct it.

Engines with flat tappet cams only - Start the engine and bring it to 2,000 RPM. Get the engine running smoothly. Then vary the engine speed from 1,800-2,200 RPM in a slow acceleration/deceleration cycle for 30 minutes. This is necessary to provide adequate oil splash and lifter rotation to properly mate each lifter to its lobe. 

At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil. After 6,000 miles, synthetic oils can be used in your engine.  For flat tappet cam engines, continued use of oil with zinc or a zinc additive for the life of your engine is recommended. 

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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