Pontiac 305ci 11.38:1 Specs
Pontiac Pontiac 305ci · 3.736" × 3.484" · 11.38:1 engine specs: 305 ci (5L), 8-cylinder, 3.736" bore x 3.484" stroke, 11.38:1 compression.
Dimensions
| Displacement | 305 ci / 5 L |
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| Bore | 3.736" |
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| Stroke | 3.484" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 11.38:1 |
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| Rod length | 5.7" |
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| Rod ratio | 1.636 |
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| Bore/stroke ratio | 1.072 |
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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 | 170 hp |
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| Years | 1988–1991 |
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What these numbers mean
| Bore/stroke character | 1.072 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,484 ft/min — conservative for a street engine |
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| Rod ratio | 1.636 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 38.1 ci |
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| Static compression | 11.38:1 — high enough that pump premium or better is normally required |
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Cylinder head
| Intake valve diameter | 1.845" |
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| Exhaust valve diameter | 1.505" |
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Variants sharing these dimensions (3)
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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| 1988 | 170 hp | — |
| 1989 | 170 hp | — |
| 1991 | 170 hp | — |
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