GMC 402 Specs
GMC 402 engine specs: 402 ci (6.6L), 8-cylinder, 4.2008" bore x 3.7" stroke, 8.5:1 compression.
Dimensions
| Displacement | 402 ci / 6.6 L |
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| Bore | 4.2008" |
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| Stroke | 3.7" |
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| Cylinders | 8 |
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| Compression ratio | 8.5:1 |
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| Bore/stroke ratio | 1.135 |
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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 | 240 hp |
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What these numbers mean
| Bore/stroke character | 1.135 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,700 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 50.3 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 (2)
- GMC C/K Series
- GMC Suburban
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