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Mercury FE (1963–1964) specs: 427 ci (7.0L) 8-cylinder, 4.228 x 3.787 in (107.4 x 96.2 mm) bore and stroke. Rated 410-425 hp, 1963–1964. OHV.
The Mercury FE (1963–1964) is oversquare — the 4.2283" bore exceeds the 3.7874" stroke by 11.6% — a layout that favors airflow and RPM over leverage at the crank. The 3.7874" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 53.4 ci (875 cc).
It is one of 24 engines in the FE family, sitting between the 352 ci and 428 ci members. 4 factory variants share these dimensions, rated from 410 to 425 hp across 1963–1964.
| Displacement | 427 ci / 7 L |
|---|---|
| Bore | 4.2283" |
| Stroke | 3.7874" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 11.2–11.5:1 (published figures vary) |
| Bore/stroke ratio | 1.116 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-5-4-2-6-3-7-8 |
| Advertised HP | 410–425 hp |
| Years | 1963–1964 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1963 | gross | 410 @ 5600 | 476 lb-ft @ 3400 | 11.5:1 |
| 1963 | gross | 425 @ 6000 | 489 lb-ft @ 3700 | 11.5:1 |
| 1964 | gross | 410 @ 5600 | 476 lb-ft @ 3400 | 11.5:1 |
| 1964 | gross | 425 @ 6000 | 480 lb-ft @ 3700 | 11.2:1 |
Factory specification sheet.
| Bore/stroke character | 1.116 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,787 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 53.4 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 |
|---|---|---|
| 1963 | 410 hp | — |
| 1963 | 425 hp | — |
| 1964 | 410 hp | — |
| 1964 | 425 hp | — |