Chevrolet 327ci 12.5:1 Specs
Chevrolet Chevrolet 327ci · 4.065" × 3.150" · 12.5:1 engine specs: 327 ci (5.4L), 8-cylinder, 4.065" bore x 3.15" stroke, 12.5:1 compression.
Dimensions
| Displacement | 327 ci / 5.4 L |
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| Bore | 4.065" |
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| Stroke | 3.15" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 12.5:1 |
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| Rod length | 6.56" |
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| Rod ratio | 2.083 |
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| Bore/stroke ratio | 1.29 |
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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 | 390 hp |
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| Years | 2020–2023 |
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What these numbers mean
| Bore/stroke character | 1.290 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,150 ft/min — conservative for a street engine |
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| Rod ratio | 2.083 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 40.9 ci |
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| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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Cylinder head
| Intake valve diameter | 2.135" |
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| Exhaust valve diameter | 1.595" |
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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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| 2020 | 390 hp | — |
| 2023 | 390 hp | — |
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