Breakdown of Included Items

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 

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
• 2400-2800 Stall Converter
• Features 5-pinion gear sets
• Heat-treated stator shaft splines
• Induction-hardened turbine shaft
• Specific valve-body calibration
• Seven-plate clutch
• Remanufactured

4L70-E SuperMatic Gear Ratios:

• 1st: 3.06:1
• 2nd: 1.62:1
• 3rd: 1.00:1
• 4th: 0.70:1

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 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 RPM's, with no-load on the engine for the first 30 minutes. This is critical to break 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 letting off in gear and coasting back down to 20 MPH. Run a couple of hard throttle accelerations up to about 5000 RPM (55 to 60 MPH), then letting off in gear and coasting back down to 20 MPH.

Let the engine cool and change the oil and filter using conventional (non-synthetic) oil and check coolant level, top off if necessary. Drive the next 500 miles normally, without high RPM's (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 level 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.

19433046K supersedes 19432113K, 19420597K

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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