Plymouth LM Specs
Plymouth LM engine specs: 318 ci (5.2L), 8-cylinder, 3.9094" bore x 3.311" stroke, 9:1 compression.
Dimensions
| Displacement | 318 ci / 5.2 L |
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| Bore | 3.9094" |
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| Stroke | 3.311" |
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| Cylinders | 8 |
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| Compression ratio | 9:1 |
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| Bore/stroke ratio | 1.181 |
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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 | 230 hp |
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What these numbers mean
| Bore/stroke character | 1.181 — 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 | 39.8 ci |
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| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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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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| — | 230 hp | LM |
| — | 230 hp | LA-318, 318, E, LM |
Vehicles (7)
- Plymouth Satellite
- Plymouth Fury
- Plymouth Duster
- Satellite
- Gran Fury
- Road Runner
- Plymouth Volaré
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