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Mercury FE (1963) specs: 406 ci (6.7L) 8-cylinder, 4.15 x 3.787 in (105.4 x 96.2 mm) bore and stroke. Rated 385-405 hp, 1963. Used in the Ford Galaxie. OHV.
The Mercury FE (1963) is oversquare — the 4.1496" bore exceeds the 3.7874" stroke by 9.6% — 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 50.8 ci (832 cc).
It is one of 34 engines in the FE family, sitting between the 332 ci and 428 ci members. 2 factory variants share these dimensions, rated from 385 to 405 hp in 1963.
| Displacement | 406 ci / 6.7 L |
|---|---|
| Bore | 4.1496" |
| Stroke | 3.7874" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.096 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 385–405 hp |
| Years | 1963 |
| Bore/stroke character | 1.096 — 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 | 50.8 ci |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1963 | 385 hp | — |
| 1963 | 405 hp | — |