Considering an ECU remap for your GMC Sierra 6.2 V8 420hp? A Stage 1 remap can take this 2017 -> petrol engine from 420 BHP to 440 BHP and from 609 Nm to 630 Nm of torque (naturally aspirated). This engine scores 3/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your GMC Sierra can achieve.
The GMC Sierra 6.2 V8 420hp is a 6.2L naturally aspirated petrol engine producing 420 BHP and 609 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 440 BHP and 630 Nm — a gain of around 20 BHP (5%) and 21 Nm (3%).
This engine has low remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, based on the percentage gain available from the factory output.
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
| Engine | BHP | Gain | Torque | Gain | Score |
|---|---|---|---|---|---|
| 4.3 V6 285hp | 285 → 305 | +20 | 413 → 440 | +27 | Limited (3.5/10) |
| 5.3 V8 355hp | 355 → 375 | +20 | 519 → 540 | +21 | Limited (3/10) |
| 6.0 V8 360hp | 360 → 383 | +23 | 515 → 539 | +24 | Limited (3.5/10) |
| 6.6 V8 445hp | 445 → 500 | +55 | 1234 → 1350 | +116 | Good (6.5/10) |
Get a personalised remap quote for your GMC Sierra. We'll connect you with a trusted professional in your area.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method.
We recommend discussing your specific vehicle with a qualified remap professional before proceeding.
