GMC 305 Specs
GMC 305 engine specs: 305 ci (5L), 8-cylinder, 3.75" bore x 3.4799" stroke, 8.5:1 compression.
Dimensions
| Displacement | 305 ci / 5 L |
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| Bore | 3.75" |
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| Stroke | 3.4799" |
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| Cylinders | 8 |
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| Compression ratio | 8.5:1 |
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| Bore/stroke ratio | 1.078 |
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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 | 130 hp |
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What these numbers mean
| Bore/stroke character | 1.078 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,480 ft/min — conservative for a street engine |
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| Displacement per cylinder | 38.1 ci |
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| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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Vehicles (4)
- GMC C/K Series
- GMC Jimmy
- GMC Safari
- GMC Vandura
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