Cadillac Northstar 10.3:1 Specs
Cadillac Northstar · 3.661" × 3.307" · 10.3:1 engine specs: 279 ci (4.6L), 8-cylinder, 3.6614" bore x 3.3071" stroke, 10.3:1 compression.
Dimensions
| Displacement | 279 ci / 4.6 L |
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| Bore | 3.6614" |
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| Stroke | 3.3071" |
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| Cylinders | 8 |
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| Compression ratio | 10.3:1 |
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| Bore/stroke ratio | 1.107 |
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Construction
| Block material | aluminum |
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| Head material | aluminum |
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| Valvetrain | DOHC |
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| Fuel type | gas |
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| Advertised HP | 275–320 hp |
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What these numbers mean
| Bore/stroke character | 1.107 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,307 ft/min — conservative for a street engine |
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| Displacement per cylinder | 34.9 ci |
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| Static compression | 10.3:1 — in the range that usually runs on pump premium |
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Variants sharing these dimensions (3)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| — | 275 hp | LD8 |
| — | 300 hp | L37 |
| — | 320 hp | LH2 |
Vehicles (15)
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- Cadillac DeVille Concours
- Seville STS
- Eldorado ETC
- DTS Performance
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