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Cadillac LFX specs: 217 ci (3.6L) 6-cylinder, 3.701 x 3.37 in (94 x 85.6 mm) bore and stroke, 11.5:1 compression. Rated 318-321 hp, 2012–2015.
The Cadillac High Feature V6 (LFX) is oversquare — the 3.7008" bore exceeds the 3.3701" stroke by 9.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.3701" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 36.2 ci (593 cc).
11.5:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 10 engines in the High Feature V6 family, the smallest at 217 ci. 5 factory variants share these dimensions, rated from 318 to 321 hp across 2012–2015.
| Displacement | 217 ci / 3.6 L |
|---|---|
| Bore | 3.7008" |
| Stroke | 3.3701" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 11.5:1 |
| Bore/stroke ratio | 1.098 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 318–321 hp |
| Years | 2012–2015 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2012 | LFX net | 318 @ 6800 | 275 lb-ft @ 4900 | — |
| 2014 | LFX net | 318 @ 6800 | 275 lb-ft @ 4900 | — |
| 2014 | LFX net | 321 | 275 lb-ft | — |
| 2015 | LFX net | 321 | — | — |
Factory specification sheet.
| Bore/stroke character | 1.098 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,370 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.2 ci |
| Static compression | 11.5:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2012 | 318 hp | LFX |
| 2013 | 318 hp | LFX |
| 2014 | 318 hp | LFX |
| 2014 | 321 hp | LFX |
| 2015 | 321 hp | LFX |
1 factory vehicle, 2012–2015. Each year opens that model's engine table.