GMC 307 Specs
GMC 307 engine specs: 307 ci (5L), 8-cylinder, 3.7992" bore x 3.3819" stroke, 8:1 compression.
Dimensions
| Displacement | 307 ci / 5 L |
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| Bore | 3.7992" |
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| Stroke | 3.3819" |
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| Cylinders | 8 |
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| Compression ratio | 8:1 |
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| Bore/stroke ratio | 1.123 |
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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 | 140 hp |
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What these numbers mean
| Bore/stroke character | 1.123 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,382 ft/min — conservative for a street engine |
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| Displacement per cylinder | 38.4 ci |
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| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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Vehicles (4)
- Oldsmobile Cutlass
- Buick Regal
- Chevrolet Caprice
- Pontiac Grand Prix
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