Chevrolet Performance SP383 EFI Turn-Key Long Block Crate Engine — 450 HP (19435454, formerly 19433046)

The GM crate engine with everything done: 450 horsepower, self-learning EFI, factory engineering. The Chevrolet Performance SP383 EFI Turn-Key is Chevrolet’s own 383 stroker small block — the same family that dyno-tested stronger than its rating in independent tests — delivered with a pre-programmed, self-learning fuel injection system, ECU and harness installed. Fast Burn aluminum heads, forged steel crank, forged rods, hydraulic roller cam, 9.9:1 compression on premium pump fuel. Add fuel, headers and ignition hardware, and drive. Crated and shipped fast across Europe from NH Race Engine.

Why Choose the SP383 EFI GM Crate Engine?

There’s exactly one engine builder whose name is on the block: Chevrolet. The SP383 is the flagship of Chevrolet Performance’s Special Performance line — a 383 stroker that takes the classic small block and adds the best of the modern parts bin: Fast Burn aluminum heads with 2.00″ valves and beehive springs, a steel hydraulic roller cam, and a forged rotating assembly. In Hot Rod’s independent Westech dyno test, the SP383 family made more than its rated power — Chevrolet under-promises and over-delivers.

The “Turn-Key” part is the real story: the EFI system arrives pre-programmed and self-learning — no laptop tuning, no dyno time, no guesswork. It corrects for altitude, weather and fuel quality as you drive, exactly the way a modern car does. For European builders who want OEM engineering with classic small block character, this is the shortest path from crate to cruising.

GM Crate Engine Key Features & Benefits

• 450 HP / 436 TQ — Factory-Rated, Independently Proven: Chevrolet’s own rating; independent dyno testing has shown the SP383 family exceeding it.
• Self-Learning EFI Included: Pre-programmed throttle-body EFI with ECU and harness — tunes itself as you drive, no laptop required.
• Fast Burn Aluminum Heads: 62cc chambers, 2.00″/1.55″ valves, beeh