Ford 390ci 10.5:1 Specs
Ford Ford 390ci · 4.052" × 3.784" · 10.5:1 engine specs: 390 ci (6.4L), 8-cylinder, 4.052" bore x 3.784" stroke, 10.5:1 compression.
Dimensions
| Displacement | 390 ci / 6.4 L |
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| Bore | 4.052" |
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| Stroke | 3.784" |
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| Cylinders | 8 |
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| Compression ratio | 10.5:1 |
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| Rod length | 6.488" |
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| Rod ratio | 1.715 |
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| Bore/stroke ratio | 1.071 |
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| Piston deck clearance | 0.0005" |
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Construction
| Induction | 1-2 |
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| Advertised HP | 265–325 hp |
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| Years | 1968–1970 |
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What these numbers mean
| Bore/stroke character | 1.071 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,784 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.715 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 48.8 ci |
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| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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Cylinder head
| Intake valve diameter | 2.037" |
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| Exhaust valve diameter | 1.566" |
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| Chamber volume | 68.1 cc |
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| Rocker ratio | 1.73:1 |
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| Lifter type | hydraulic |
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Variants sharing these dimensions (6)
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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| 1968 | 280 hp | — |
| 1968 | 315 hp | — |
| 1968 | 325 hp | — |
| 1969 | 280 hp | — |
| 1969 | 320 hp | — |
| 1970 | 265 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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