Buick 400ci 11:1 Specs
Buick Buick 400ci · 4.188" × 3.64" · 11:1 engine specs: 400 ci (6.6L), 8-cylinder, 4.188" bore x 3.64" stroke, 11:1 compression.
Dimensions
| Displacement | 400 ci / 6.6 L |
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| Bore | 4.188" |
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| Stroke | 3.64" |
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| Cylinders | 8 |
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| Compression ratio | 11:1 |
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| Rod length | 6.22" |
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| Rod ratio | 1.709 |
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| Bore/stroke ratio | 1.151 |
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| Piston deck clearance | 0.01" |
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Construction
| Induction | 1-4 |
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| Advertised HP | 332 hp |
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| Years | 1966 |
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What these numbers mean
| Bore/stroke character | 1.151 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,640 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.709 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 50.0 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 | 1.875" |
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| Exhaust valve diameter | 1.5" |
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| Chamber volume | 123.7 cc |
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| Rocker ratio | 1.6:1 |
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| Lifter type | hydraulic |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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