Mercury 289 Specs
Mercury 289 engine specs: 289 ci (4.7L), 8-cylinder, 4" bore x 2.8701" stroke, 9.3:1 compression.
Dimensions
| Displacement | 289 ci / 4.7 L |
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| Bore | 4" |
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| Stroke | 2.8701" |
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| Cylinders | 8 |
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| Compression ratio | 9.3:1 |
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| Bore/stroke ratio | 1.394 |
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| Piston deck clearance | 0.0015" |
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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 | 200 hp |
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What these numbers mean
| Bore/stroke character | 1.394 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,870 ft/min — conservative for a street engine |
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| Displacement per cylinder | 36.1 ci |
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| Static compression | 9.3:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.783" |
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| Exhaust valve diameter | 1.457" |
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| Chamber volume | 51.99 cc |
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| Rocker ratio | 1.6:1 |
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| Lifter type | hydraulic |
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Vehicles (7)
- Comet
- Cougar
- Meteor
- Mercury Comet
- Mercury Cougar
- Mercury Monterey
- Mercury Montego
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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