Chevrolet 409ci 11:1 Specs
Chevrolet Chevrolet 409ci · 4.313" × 3.5" · 11:1 engine specs: 409 ci (6.7L), 8-cylinder, 4.313" bore x 3.5" stroke, 11:1 compression.
Dimensions
| Displacement | 409 ci / 6.7 L |
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| Bore | 4.313" |
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| Stroke | 3.5" |
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| Cylinders | 8 |
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| Compression ratio | 11:1 |
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| Rod length | 6.01" |
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| Rod ratio | 1.717 |
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| Bore/stroke ratio | 1.232 |
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| Piston deck clearance | 0.011" |
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Construction
| Induction | 1-4 |
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| Advertised HP | 400 hp |
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| Years | 1965 |
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What these numbers mean
| Bore/stroke character | 1.232 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,500 ft/min — conservative for a street engine |
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| Rod ratio | 1.717 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 51.1 ci |
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| Static compression | 11:1 — high enough that pump premium or better is normally required |
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Cylinder head
| Intake valve diameter | 2.195" |
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| Exhaust valve diameter | 1.725" |
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| Rocker ratio | 1.75:1 |
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| Lifter type | mechanical |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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