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Mercury Windsor (1967) specs: 289 ci (4.7L) 8-cylinder, 4.00 x 2.87 in (101.6 x 72.9 mm) bore and stroke. Rated 225 hp, 1967. Used in the Mercury Cougar. OHV.
The Mercury Windsor (1967) is oversquare — the 4" bore exceeds the 2.8701" stroke by 39.4% — a layout that favors airflow and RPM over leverage at the crank. The 2.8701" stroke does not reach 4,000 ft/min of mean piston speed until about 8,350 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 36.1 ci (592 cc).
It is one of 24 engines in the Windsor family, sitting between the 221 ci and 351 ci members.
| Displacement | 289 ci / 4.7 L |
|---|---|
| Bore | 4" |
| Stroke | 2.8701" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.394 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 225 hp |
| Years | 1967 |
| Bore/stroke character | 1.394 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,870 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.1 ci |
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