GMC 403 Specs
GMC 403 engine specs: 403 ci (6.6L), 8-cylinder, 4.126" bore x 3.752" stroke, 8:1 compression.
Dimensions
| Displacement | 403 ci / 6.6 L |
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| Bore | 4.126" |
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| Stroke | 3.752" |
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| Cylinders | 8 |
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| Compression ratio | 8:1 |
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| Bore/stroke ratio | 1.1 |
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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 | 185 hp |
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What these numbers mean
| Bore/stroke character | 1.100 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,752 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 50.4 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
- Pontiac Trans Am
- Buick Riviera
- Cadillac Eldorado
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