Chevrolet Chevr 2023 402 430HP Specs
Chevrolet Chevr 2023 402 430HP engine specs: 402 ci (6.6L), 8-cylinder, 4.065" bore x 3.858" stroke, 14:1 compression.
Dimensions
| Displacement | 402 ci / 6.6 L |
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| Bore | 4.065" |
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| Stroke | 3.858" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 14:1 |
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| Rod length | 6.125" |
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| Rod ratio | 1.588 |
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| Bore/stroke ratio | 1.054 |
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| Piston deck clearance | 0" |
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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 | 430 hp |
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| Years | 2023 |
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What these numbers mean
| Bore/stroke character | 1.054 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,858 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.588 — moderate — the range most production V8s fall in |
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| Displacement per cylinder | 50.3 ci |
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| Static compression | 14:1 — high enough that pump premium or better is normally required |
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Cylinder head
| Intake valve diameter | 2.135" |
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| Exhaust valve diameter | 1.595" |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
← All Chevrolet 402ci engines