Ford 390ci 11.3:1 Specs
Ford Ford 390ci · 4.052" × 3.784" · 11.3:1 engine specs: 390 ci (6.4L), 8-cylinder, 4.052" bore x 3.784" stroke, 11.3:1 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 | 11.3:1 |
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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 | 0.001" |
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Construction
| Induction | 1-4 |
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| Advertised HP | 320 hp |
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| Years | 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 | 11.3:1 — high enough that pump premium or better is normally required |
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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 | 63.5 cc |
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| Rocker ratio | 1.73:1 |
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| Lifter type | hydraulic |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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