Chevrolet 409ci 14.2:1 Specs
Chevrolet Chevrolet 409ci · 4.125" × 3.825" · 14.2:1 engine specs: 409 ci (6.7L), 8-cylinder, 4.125" bore x 3.825" stroke, 14.2:1 compression.
Dimensions
| Displacement | 409 ci / 6.7 L |
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| Bore | 4.125" |
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| Stroke | 3.825" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 14.2:1 |
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| Rod length | 6.2" |
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| Rod ratio | 1.621 |
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| Bore/stroke ratio | 1.078 |
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| Piston deck clearance | 0.01" |
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Construction
| Block material | cast iron |
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| Head material | cast iron |
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| Valvetrain | OHV |
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| Fuel type | gas |
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| Advertised HP | 450 hp |
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| Years | 2016–2017 |
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What these numbers mean
| Bore/stroke character | 1.078 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,825 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.621 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 51.1 ci |
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| Static compression | 14.2:1 — high enough that pump premium or better is normally required |
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Cylinder head
| Intake valve diameter | 2.205" |
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| Exhaust valve diameter | 1.615" |
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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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| 2016 | 450 hp | — |
| 2017 | 450 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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