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Mercury FE (1966–1967) specs: 410 ci (6.7L) 8-cylinder, 4.051 x 3.98 in (102.9 x 101.1 mm) bore and stroke, 10.5:1 compression. Rated 330 hp, 1966–1967.
The Mercury FE (1966–1967) is close to square: 4.0512" bore against 3.9803" stroke, within 1.8%, which splits the difference between a high-revving layout and a torque layout. The 3.9803" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 51.3 ci (840 cc).
10.5:1 on iron heads is in the range that usually runs on pump premium; iron holds heat, so treat it as the less forgiving side of that range.
It is one of 24 engines in the FE family, sitting between the 352 ci and 428 ci members. 2 factory variants share these dimensions, rated at 330 hp across 1966–1967.
| Displacement | 410 ci / 6.7 L |
|---|---|
| Bore | 4.0512" |
| Stroke | 3.9803" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.018 |
| 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 | 330 hp |
| Years | 1966–1967 |
| Bore/stroke character | 1.018 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,980 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 51.3 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 1966 | 330 hp | — |
| 1967 | 330 hp | — |
4 factory vehicles, 1966–1967. Each year opens that model's engine table.