Oldsmobile 324ci 8.5:1 Specs
Oldsmobile Oldsmobile 324ci · 3.875" × 3.438" · 8.5:1 engine specs: 324 ci (5.3L), 8-cylinder, 3.875" bore x 3.438" stroke, 8.5:1 compression.
Dimensions
| Displacement | 324 ci / 5.3 L |
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| Bore | 3.875" |
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| Stroke | 3.438" |
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| Cylinders | 8 |
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| Compression ratio | 8.5:1 |
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| Rod length | 6.625" |
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| Rod ratio | 1.927 |
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| Bore/stroke ratio | 1.127 |
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Construction
| Induction | 1-2 |
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| Advertised HP | 185–202 hp |
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| Years | 1955 |
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What these numbers mean
| Bore/stroke character | 1.127 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,438 ft/min — conservative for a street engine |
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| Rod ratio | 1.927 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 40.5 ci |
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| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Chamber volume | 88.48 cc |
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| Rocker ratio | 1.8:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (2)
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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| 1955 | 185 hp | — |
| 1955 | 202 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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