SP383 Turn-Key 383ci/450HP Tech Specs:

• Balance: External
• Block: Cast iron with 4-bolt main caps
• Bore x Stroke: 4.005 in. x 3.800 in.
• Camshaft: Steel hydraulic roller
• Camshaft Duration: 208-degree intake / 221-degree exhaust (at 0.050 in.)
• Compression Ratio: 9.72:1
• Connecting Rods: Heavy-duty forged steel
• Crankshaft: Forged steel
• Cylinder Heads: Fast Burn aluminum with 62 cc chambers
• Displacement: 383 ci
• Engine Type: Chevy Small-Block V8
• Flexplate: 12.750 in. Diameter, 153-tooth
• Fuel: 91-94 Octane (premium)
• Ignition Timing: 36-degree at 4000 RPM
• Max Recommended RPM: 6000
• Pistons: Hypereutectic aluminum
• Rocker Arms: Aluminum roller-style
• Rocker Arm Ratio: 1.5:1
• Valve Lift: 0.474 in. intake/ 0.510 in. exhaust
• Valve Size: 2.000 in. intake/ 1.550 in. exhaust 

Installation Notes:

This is a turn-key engine and includes, but is not limited to, additional accessories such as the air cleaner, MPFI system, damper, distributor, throttle body, starter, fuel pump, A/C compressor alternator and other components to complete the front accessory drive system as well as a pre-programmed self-learning engine controller.

The included flexplate is designed for automatic transmission applications. If using this engine in a manual transmission application, an externally-balanced flywheel is required (sold separately).

Not intended for marine use

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.