Mercury 406 Specs
Mercury 406 engine specs: 406 ci (6.7L), 8-cylinder, 4.1496" bore x 3.7874" stroke, 11.4:1 compression.
Dimensions
| Displacement | 406 ci / 6.7 L |
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| Bore | 4.1496" |
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| Stroke | 3.7874" |
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| Cylinders | 8 |
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| Compression ratio | 11.4:1 |
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| Bore/stroke ratio | 1.096 |
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Construction
| Block material | cast iron |
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| Head material | cast iron |
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| Valvetrain | OHV |
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| Fuel type | gas |
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| Advertised HP | 385 hp |
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What these numbers mean
| Bore/stroke character | 1.096 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,787 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 50.8 ci |
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| Static compression | 11.4:1 — high enough that pump premium or better is normally required |
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Vehicles (2)
- Mercury Monterey
- Mercury S-55
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