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Mercury Windsor (1964–1967) specs: 289 ci (4.7L) 8-cylinder, 4.00 x 2.87 in (101.6 x 72.9 mm) bore and stroke. Rated 200-225 hp, 1964–1967.
The Mercury Windsor (1964–1967) 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. A rod ratio of 1.796 is long by production standards — less side-load on the cylinder wall and gentler piston acceleration around TDC, the geometry that tolerates high RPM. Each of the 8 cylinders displaces 36.1 ci (592 cc).
It is one of 18 engines in the Windsor family, sitting between the 221 ci and 351 ci members. 4 factory variants share these dimensions, rated from 200 to 225 hp across 1964–1967.
| Displacement | 289 ci / 4.7 L |
|---|---|
| Bore | 4" |
| Stroke | 2.8701" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9–9.8:1 (published figures vary) |
| Rod length | 5.155" |
| Rod ratio | 1.796 |
| Bore/stroke ratio | 1.394 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 200–225 hp |
| Years | 1964–1967 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1964 | EGA gross | 210 @ 4400 | 300 lb-ft @ 2800 | 9:1 |
| 1966 | gross | 200 @ 4400 | 282 lb-ft @ 2400 | 9.3:1 |
| 1967 | C gross | 200 @ 4400 | 282 lb-ft @ 2400 | 9.3:1 |
| 1967 | A gross | 225 @ 4800 | 305 lb-ft @ 3200 | 9.8:1 |
Factory specification sheet.
| 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 |
| Rod ratio | 1.796 — long — less side loading on the cylinder wall, favours high RPM |
| Displacement per cylinder | 36.1 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 |
|---|---|---|
| 1964 | 210 hp | — |
| 1966 | 200 hp | — |
| 1967 | 200 hp | — |
| 1967 | 225 hp | — |
2 factory vehicles, 1964–1967. Each year opens that model's engine table.