Pontiac 307ci 9.241:1 Specs
Pontiac Pontiac 307ci · 3.800" × 3.385" · 9.241:1 engine specs: 307 ci (5L), 8-cylinder, 3.8" bore x 3.385" stroke, 9.241:1 compression.
Dimensions
| Displacement | 307 ci / 5 L |
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| Bore | 3.8" |
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| Stroke | 3.385" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 9.241:1 |
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| Rod length | 6.002" |
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| Rod ratio | 1.773 |
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| Bore/stroke ratio | 1.123 |
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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 | 138–140 hp |
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| Years | 1989 |
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What these numbers mean
| Bore/stroke character | 1.123 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,385 ft/min — conservative for a street engine |
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| Rod ratio | 1.773 — 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 | 9.241:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.75" |
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| Exhaust valve diameter | 1.502" |
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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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| 1989 | 138 hp | — |
| 1989 | 140 hp | — |
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