GMC 8V53 Specs
GMC 8V53 engine specs: 424 ci (6.9L), 8-cylinder, 3.8189" bore x 4.4882" stroke, 17:1 compression.
Dimensions
| Displacement | 424 ci / 6.9 L |
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| Bore | 3.8189" |
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| Stroke | 4.4882" |
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| Cylinders | 8 |
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| Compression ratio | 17:1 |
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| Bore/stroke ratio | 0.851 |
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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 | 250 hp |
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What these numbers mean
| Bore/stroke character | 0.851 — 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 | 53.0 ci |
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| Static compression | 17:1 — high enough that pump premium or better is normally required |
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Vehicles (4)
- GMC General
- GMC Brigadier
- Various heavy-duty trucks
- Industrial applications
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