GMC 287 Specs
GMC 287 engine specs: 287 ci (4.7L), 8-cylinder, 3.75" bore x 3.2799" stroke, 8:1 compression.
Dimensions
| Displacement | 287 ci / 4.7 L |
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| Bore | 3.75" |
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| Stroke | 3.2799" |
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| Cylinders | 8 |
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| Compression ratio | 8:1 |
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| Bore/stroke ratio | 1.143 |
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| Piston deck clearance | 0.05" |
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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 | 180 hp |
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What these numbers mean
| Bore/stroke character | 1.143 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,280 ft/min — conservative for a street engine |
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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 | 1.787" |
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| Exhaust valve diameter | 1.406" |
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| Chamber volume | 52.9 cc |
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| Rocker ratio | 1.5:1 |
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| Lifter type | hydraulic |
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Vehicles (3)
- Pontiac Chieftain
- Pontiac Star Chief
- Pontiac Catalina
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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