Buick 301ci 8.741:1 Specs
Buick Buick 301ci · 4.002" × 3.010" · 8.741:1 engine specs: 301 ci (4.9L), 8-cylinder, 4.002" bore x 3.01" stroke, 8.741:1 compression.
Dimensions
| Displacement | 301 ci / 4.9 L |
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| Bore | 4.002" |
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| Stroke | 3.01" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 8.741:1 |
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| Rod length | 6.05" |
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| Rod ratio | 2.01 |
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| Bore/stroke ratio | 1.33 |
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| Piston deck clearance | 0.018" |
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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 | 140–150 hp |
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| Years | 1979 |
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What these numbers mean
| Bore/stroke character | 1.330 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,010 ft/min — conservative for a street engine |
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| Rod ratio | 2.01 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 37.6 ci |
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| Static compression | 8.741:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.72" |
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| Exhaust valve diameter | 1.5" |
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| Chamber volume | 67.47 cc |
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| Rocker ratio | 1.5:1 |
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| Lifter type | hydraulic |
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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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| 1979 | 140 hp | — |
| 1979 | 150 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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