Breakdown of Included Items

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
• 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 

T56 Super Magnum Transmission

The Chevrolet Performance T56 Super Magnum Six-Speed Manual Transmission is a TREMEC six-speed manual with high-torque capacity that specially designed for custom, retro-fit installations using Chevrolet Performance crate engines. The exterior case similar to the fourth-generation F-body transmission that uses stronger, high-capacity gear sets, input shaft, and output shaft found in the TREMEC TR6060.

T56 Super Magnum Features:

• Six-Speed Manual
• 700 lb.-ft. Maximum Torque Capacity
• 26-Spline Input Shaft
• 31-Spline Output Shaft
• Slip-Yoke Design
• Two-Position Shifter Plate Included, With the Third Position Built Into The Transmission
• 4th Gen F-Body Bellhousing and Hydraulic Throwout Bearing

T56 Super Magnum Gear Ratios:

• 1st: 2.66:1
• 2nd: 1.78:1
• 3rd: 1.30:1
• 4th: 1.00:1
• 5th 0.80:1
• 6th 0.63:1

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.

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.