SP383 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: 32-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 deluxe engine and includes, but is not limited to, additional accessories such as the MPFI system, damper, distributor, throttle body 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 conventional or break-in oil (non-synthetic) for the first oil change, be sure to check the oil level in the engine and prime the oil system with an engine priming tool.

Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPMs, with no-load on the engine for the first 30 minutes. This is critical to breaking in the camshaft.

Drive the vehicle with varying speeds and loads on the engine for the first 30 miles. Be sure not to use a lot of throttle or high RPM. Run five or six medium-throttle accelerations to about 3000 RPM (40 to 50 MPH), then let off in gear and coast back down to 20 MPH. Run a couple of hard throttle accelerations up to about 5000 RPM (55 to 60 MPH), then let off in gear and coast back down to 20 MPH.

Let the engine cool and change the oil and filter using conventional (non-synthetic) oil and check the coolant level, top off if necessary. Drive the next 500 miles normally, without high RPMs (below 5000 RPM), hard use, or extended periods of high loading. Change the oil and oil filter again using conventional (non-synthetic) oil. Keep an eye on oil levels during the first thousand or so miles.

It would be suitable to use synthetic motor oil after the second recommended oil change and mileage accumulation.

19433045 supersedes 19432112, 19418640

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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