Pontiac 455ci 8.051:1 Specs
Pontiac Pontiac 455ci · 4.153" × 4.214" · 8.051:1 engine specs: 455 ci (7.5L), 8-cylinder, 4.153" bore x 4.214" stroke, 8.051:1 compression.
Dimensions
| Displacement | 455 ci / 7.5 L |
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| Bore | 4.153" |
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| Stroke | 4.214" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 8.051:1 |
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| Rod length | 6.625" |
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| Rod ratio | 1.572 |
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| Bore/stroke ratio | 0.986 |
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| Piston deck clearance | 0" |
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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 | 200 hp |
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| Years | 1975–1976 |
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What these numbers mean
| Bore/stroke character | 0.986 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 4,214 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.572 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 56.9 ci |
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| Static compression | 8.051:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 2.113" |
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| Exhaust valve diameter | 1.663" |
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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 | 200 hp | — |
| 1976 | 200 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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