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Mercury 332 specs: 332 ci (5.4L) 8-cylinder, 4.00 x 3.299 in (101.6 x 83.8 mm) bore and stroke, 9.6:1 compression. Rated 225 hp. Rod ratio and piston speed.
The Mercury FE (332) is oversquare — the 4" bore exceeds the 3.2992" stroke by 21.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.2992" stroke does not reach 4,000 ft/min of mean piston speed until about 7,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 41.5 ci (680 cc).
9.6:1 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 34 engines in the FE family, the smallest at 332 ci. Factory fitments include the Mercury Monterey.
| Displacement | 332 ci / 5.4 L |
|---|---|
| Bore | 4" |
| Stroke | 3.2992" |
| Cylinders | 8 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 1.212 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 225 hp |
| Bore/stroke character | 1.212 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,299 ft/min — conservative for a street engine |
| Displacement per cylinder | 41.5 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
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