Chevrolet 307ci 9.651:1 Specs
Chevrolet Chevrolet 307ci · 3.875" × 3.250" · 9.651:1 engine specs: 307 ci (5L), 8-cylinder, 3.875" bore x 3.25" stroke, 9.651:1 compression.
Dimensions
| Displacement | 307 ci / 5 L |
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| Bore | 3.875" |
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| Stroke | 3.25" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 9.651:1 |
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| Rod length | 5.7" |
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| Rod ratio | 1.754 |
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| Bore/stroke ratio | 1.192 |
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| Piston deck clearance | 0.002" |
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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 | 115–130 hp |
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| Years | 1972–1973 |
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What these numbers mean
| Bore/stroke character | 1.192 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,250 ft/min — conservative for a street engine |
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| Rod ratio | 1.754 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 38.4 ci |
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| Static compression | 9.651:1 — in the range that usually runs on pump premium |
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Cylinder head
| Intake valve diameter | 1.725" |
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| Exhaust valve diameter | 1.505" |
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| Chamber volume | 65.5 cc |
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| Rocker ratio | 1.5:1 |
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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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| 1972 | 130 hp | — |
| 1973 | 115 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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