Pontiac 287ci 8:1 Specs
Pontiac Pontiac 287ci · 3.75" × 3.25" · 8:1 engine specs: 287 ci (4.7L), 8-cylinder, 3.75" bore x 3.25" stroke, 8:1 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 | 8:1 |
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| Rod length | 6.625" |
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| Rod ratio | 2.038 |
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| Bore/stroke ratio | 1.154 |
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| Piston deck clearance | 0" |
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Construction
| Induction | 1-2 |
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| Advertised HP | 180–200 hp |
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| Years | 1955 |
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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 | 2.038 — 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 | 8:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.78" |
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| Exhaust valve diameter | 1.5" |
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| Chamber volume | 73 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 (2)
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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| 1955 | 180 hp | — |
| 1955 | 200 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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