Pontiac 455 Specs
Pontiac 455 engine specs: 455 ci (7.5L), 8-cylinder, 4.189" bore x 4.063" stroke, 8:1 compression.
Dimensions
| Displacement | 455 ci / 7.5 L |
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| Bore | 4.189" |
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| Stroke | 4.063" |
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| Cylinders | 8 |
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| Compression ratio | 8:1 |
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| Bore/stroke ratio | 1.031 |
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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 | 325 hp |
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What these numbers mean
| Bore/stroke character | 1.031 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 4,063 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 56.9 ci |
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| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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Vehicles (3)
- Pontiac Firebird Trans Am
- Pontiac GTO
- Pontiac Grand Ville
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