Plymouth J Specs
Plymouth J engine specs: 340 ci (5.6L), 8-cylinder, 4.0315" bore x 3.311" stroke, 10.5:1 compression.
Dimensions
| Displacement | 340 ci / 5.6 L |
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| Bore | 4.0315" |
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| Stroke | 3.311" |
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| Cylinders | 8 |
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| Compression ratio | 10.5:1 |
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| Bore/stroke ratio | 1.218 |
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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 | 275–290 hp |
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What these numbers mean
| Bore/stroke character | 1.218 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,311 ft/min — conservative for a street engine |
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| Displacement per cylinder | 42.5 ci |
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| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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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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| — | 275 hp | J |
| — | 290 hp | J |
Vehicles (5)
- Plymouth Duster 340
- Plymouth Barracuda
- Plymouth 'Cuda 340
- Plymouth 'Cuda
- Plymouth 'Cuda AAR
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