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GMC LV1 specs: 262 ci (4.3L) 6-cylinder, 3.92 x 3.62 in (99.6 x 91.9 mm) bore and stroke. Built 2020–2026. Used in the GMC Vandura / Savana. OHV.
The GMC Vortec 4300 (4.3L V6) (LV1) is oversquare — the 3.92" bore exceeds the 3.62" stroke by 8.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.62" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 43.7 ci (716 cc).
It is one of 7 engines in the Vortec 4300 (4.3L V6) family, all of them 262 ci — the differences between them are in compression, heads and rating, not displacement. 7 factory variants share these dimensions across 2020–2026.
| Displacement | 262 ci / 4.3 L |
|---|---|
| Bore | 3.92" |
| Stroke | 3.62" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.083 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Years | 2020–2026 |
| Bore/stroke character | 1.083 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,620 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.7 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2020 | — | LV1 |
| 2021 | — | LV1 |
| 2022 | — | LV1 |
| 2023 | — | LV1 |
| 2024 | — | LV1 |
| 2025 | — | LV1 |
| 2026 | — | LV1 |
2 factory vehicles, 2018–2026. Each year opens that model's engine table.