Chevrolet LS 9.9:1 Specs
Chevrolet LS · 3.780" × 3.622" · 9.9:1 engine specs: 325 ci (5.3L), 8-cylinder, 3.7799" bore x 3.622" stroke, 9.9:1 compression.
Dimensions
| Displacement | 325 ci / 5.3 L |
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| Bore | 3.7799" |
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| Stroke | 3.622" |
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| Cylinders | 8 |
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| Compression ratio | 9.9:1 |
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| Bore/stroke ratio | 1.044 |
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Construction
| Block material | aluminum |
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| Head material | aluminum |
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| Valvetrain | OHV |
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| Fuel type | gas |
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| Advertised HP | 300–320 hp |
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What these numbers mean
| Bore/stroke character | 1.044 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 40.6 ci |
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| Static compression | 9.9:1 — in the range that usually runs on pump premium |
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Variants sharing these dimensions (3)
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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| — | 300 hp | LH6 |
| — | 310 hp | L33 |
| — | 320 hp | LMG, LC9, LMF |
Vehicles (10)
- Chevrolet Silverado 1500
- GMC Sierra 1500
- Chevrolet TrailBlazer EXT
- GMC Envoy XL/XUV
- Buick Rainier
- Saab 9-7X
- Chevrolet Tahoe
- GMC Yukon
- Chevrolet Suburban
- Chevrolet Avalanche
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