CT525 LS3 6.2L Crate Engine Specs:

• Balance: Internal
• Block: Cast-aluminum with six-bolt, cross-bolted main caps
• Bore x Stroke: 4.065 in. x 3.620 in.
• Camshaft: Hydraulic roller
• Camshaft Duration: 226-degree intake / 236-degree exhaust (at 0.050 in.)
• Compression Ratio: 10.7:1
• Connecting Rods: Powdered metal
• Connecting Rod Bolts: ARP Standard High-Performance Rod Bolts, 8740 alloy chrome-moly steel
• Crankshaft: Nodular iron
• Cylinder Heads: LS3 rectangle port; aluminum with 68cc chambers
• Displacement: 376 ci (6.2L)
• Engine Type: LS-Series Gen-IV Small-Block V-8
• Fuel: 91-94 Octane (premium)
• Max Recommended RPM: 6700
• Pistons: Forged aluminum
• Reluctor Wheel: 58X
• Rocker Arms: Investment-cast, roller trunnion
• Rocker Arm Ratio: 1.7:1
• Valve Lift: 0.525 in. intake/ 0.525 in. exhaust
• Valve Size: 2.165 in. intake/  1.590 in. exhaust 

Installation Notes:

This is a circle track engine and is not intended for street use. It is purpose-built for racing only and is sold as-is with no manufacturer warranty.

Accessories required for use such as air intake, carburetor, exhaust manifolds, front accessory drive system, fuel system, ignition controller, starter and water pump are all sold separately.

The included 6-quart oil pan is designed to clear most GM rear-steer chassis with a stock engine location.

Circle track anti-tampering seals come installed on this engine.

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.

19434598 supersedes 19432720, 19418211

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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