Chevrolet Performance SP383 C.I.D EFI Turnkey Long Block Crate Engines 19433046

This SP383 grows the small-block to 6.3 liters and swaps in factory electronic fuel injection. Chevrolet Performance quotes output north of 450 hp, with torque settling in around 436 lb-ft. A cast-iron block carries the EFI throttle body and intake manifold, compression set at 9.72:1 over a hydraulic roller camshaft, built for 383-cubic-inch street performance rather than a carbureted combination.

What arrives installed

Water pump, oil pan, valve covers, and timing cover all ship bolted to the engine, along with the EFI throttle body, intake manifold, and distributor. Because this is a turnkey EFI build, the computer and wiring harness come with it too, so the fuel-injection side of the swap does not require sourcing a separate standalone controller.

What is not in the box

A flywheel, air cleaner, and supercharger are not included, so plan for those separately depending on your transmission and induction choices. This long block is set up for fuel injection, not a carburetor, so pair it with an EFI-compatible fuel system rather than retrofitting a carbureted setup. Premium fuel is recommended given the 9.72:1 compression.

Q: Does this engine come with the computer and harness needed to run the EFI? Yes, both are included as part of this turnkey package.

Q: Can I run a carburetor on this instead? No, it is set up for fuel injection and is not designed for carbureted induction without modification.

Specifications