Pontiac 350ci 9.611:1 Specs
Pontiac Pontiac 350ci · 3.800" × 3.850" · 9.611:1 engine specs: 350 ci (5.7L), 8-cylinder, 3.8" bore x 3.85" stroke, 9.611:1 compression.
Dimensions
| Displacement | 350 ci / 5.7 L |
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| Bore | 3.8" |
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| Stroke | 3.85" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 9.611:1 |
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| Rod length | 6.387" |
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| Rod ratio | 1.659 |
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| Bore/stroke ratio | 0.987 |
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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 | 145–165 hp |
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| Years | 1975 |
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What these numbers mean
| Bore/stroke character | 0.987 — 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 | 43.8 ci |
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| Static compression | 9.611:1 — in the range that usually runs on pump premium |
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Cylinder head
| Intake valve diameter | 1.88" |
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| Exhaust valve diameter | 1.555" |
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| Chamber volume | 51 cc |
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| Rocker ratio | 1.55:1 |
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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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| 1975 | 145 hp | — |
| 1975 | 165 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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