ENGINE · 2010-present
LSX / LS3-based tuning
GM LSX 376 / 454 — Crate engine V8 (race / hot-rod community). V8 NA pushrod LSX-block crate, 6.2 / 7.4 L, 525-720 HP (LSX 454 720) stock. Cars: Custom LS swap projects, hot-rods, drag cars, LSX Bowtie crate engines.
Engine specs
| Engine code | LSX / LS3-based |
|---|---|
| Configuration | V8 NA pushrod LSX-block crate |
| Displacement | 6.2 / 7.4 L |
| Production years | 2010-present |
| Stock power | 525-720 HP (LSX 454 720) |
| ECU family | GM E38 / E67 + HP Tuners / EFILive → |
Tuning stages on LSX / LS3-based
| Stage 1 | +20-30 HP |
|---|---|
| Stage 2 | +40-60 HP |
| Stage 3 | +200+ HP (forced induction — Magnuson, Procharger, twin-turbo kits) |
Conservative real-world estimates. Actual results depend on hardware health, fuel quality, ambient temperature, and the specific calibration written.
Services available on LSX / LS3-based
Common DTC codes on LSX / LS3-based
Brands running LSX / LS3-based
Workshop workflow
- Read the LSX / LS3-based ECU via OBD or bench using your existing flasher (KESS3, AutoTuner, MPPS, Trasdata, FRF).
- Open Softechpro V5 and drag the .bin / .ori / .hex / .s19 / .frf onto the workspace. The GM E38 variant is auto-detected.
- Pick the service tab and apply Stage 1 / 2 / 3 / DPF OFF / EGR OFF / AdBlue OFF as required.
- Save patched .bin — the TPROT + multi-block CRC32 is recomputed automatically.
- Flash via your existing flasher. Adaptation reset via OEM scan tool if required.