GMC 4-71 Specs
GMC 4-71 engine specs: 284 ci (4.65L), 4-cylinder, 4.252" bore x 4.4882" stroke, 18.7:1 compression.
Dimensions
| Displacement | 284 ci / 4.65 L |
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| Bore | 4.252" |
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| Stroke | 4.4882" |
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| Cylinders | 4 |
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| Compression ratio | 18.7:1 |
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| Bore/stroke ratio | 0.947 |
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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 | diesel |
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| Advertised HP | 140 hp |
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What these numbers mean
| Bore/stroke character | 0.947 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 4,488 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 71.0 ci |
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| Static compression | 18.7:1 — high enough that pump premium or better is normally required |
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Vehicles (3)
- GMC CCKW
- M3 Half-track
- Various industrial and marine applications
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