Buick 340ci 9:1 Specs
Buick Buick 340ci · 3.75" × 3.85" · 9:1 engine specs: 340 ci (5.6L), 8-cylinder, 3.75" bore x 3.85" stroke, 9:1 compression.
Dimensions
| Displacement | 340 ci / 5.6 L |
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| Bore | 3.75" |
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| Stroke | 3.85" |
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| Cylinders | 8 |
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| Compression ratio | 9:1 |
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| Rod length | 6.387" |
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| Rod ratio | 1.659 |
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| Bore/stroke ratio | 0.974 |
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| Piston deck clearance | 0.01" |
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Construction
| Induction | 1-2 |
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| Advertised HP | 220 hp |
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| Years | 1966–1967 |
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What these numbers mean
| Bore/stroke character | 0.974 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 3,850 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.659 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 42.5 ci |
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| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.818" |
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| Exhaust valve diameter | 1.38" |
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| Chamber volume | 54.9 cc |
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| Rocker ratio | 1.6:1 |
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| Lifter type | hydraulic |
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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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| 1966 | 220 hp | — |
| 1967 | 220 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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