American Motors 287ci 8.7:1 Specs
American Motors American Motors 287ci · 3.75" × 3.25" · 8.7:1 engine specs: 287 ci (4.7L), 8-cylinder, 3.75" bore x 3.25" stroke, 8.7:1 compression.
Dimensions
| Displacement | 287 ci / 4.7 L |
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| Bore | 3.75" |
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| Stroke | 3.25" |
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| Cylinders | 8 |
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| Compression ratio | 8.7:1 |
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| Rod length | 6.375" |
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| Rod ratio | 1.962 |
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| Bore/stroke ratio | 1.154 |
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Construction
| Induction | 1-2 |
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| Advertised HP | 198 hp |
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| Years | 1963–1966 |
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What these numbers mean
| Bore/stroke character | 1.154 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,250 ft/min — conservative for a street engine |
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| Rod ratio | 1.962 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 35.9 ci |
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| Static compression | 8.7:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Chamber volume | 60.5 cc |
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| Rocker ratio | 1.5:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (4)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| 1963 | 198 hp | — |
| 1964 | 198 hp | — |
| 1965 | 198 hp | — |
| 1966 | 198 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
← All American Motors 287ci engines