Chevrolet 402ci 9.281:1 Specs
Chevrolet Chevrolet 402ci · 4.125" × 3.766" · 9.281:1 engine specs: 402 ci (6.6L), 8-cylinder, 4.125" bore x 3.766" stroke, 9.281:1 compression.
Dimensions
| Displacement | 402 ci / 6.6 L |
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| Bore | 4.125" |
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| Stroke | 3.766" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 9.281:1 |
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| Rod length | 6.136" |
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| Rod ratio | 1.629 |
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| Bore/stroke ratio | 1.095 |
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| Piston deck clearance | 0.008" |
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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 | 210–300 hp |
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| Years | 1971–1972 |
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What these numbers mean
| Bore/stroke character | 1.095 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,766 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.629 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 50.3 ci |
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| Static compression | 9.281:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 2.07" |
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| Exhaust valve diameter | 1.725" |
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| Chamber volume | 96.4 cc |
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| Rocker ratio | 1.7:1 |
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| Lifter type | hydraulic |
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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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| 1971 | 300 hp | — |
| 1972 | 210 hp | — |
| 1972 | 240 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
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