Pontiac 215ci 10.25:1 Specs
Pontiac Pontiac 215ci · 3.5" × 2.8" · 10.25:1 engine specs: 215 ci (3.5L), 8-cylinder, 3.5" bore x 2.8" stroke, 10.25:1 compression.
Dimensions
| Displacement | 215 ci / 3.5 L |
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| Bore | 3.5" |
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| Stroke | 2.8" |
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| Cylinders | 8 |
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| Compression ratio | 10.25:1 |
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| Rod length | 5.66" |
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| Rod ratio | 2.021 |
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| Bore/stroke ratio | 1.25 |
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| Piston deck clearance | 0" |
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Construction
| Induction | 1-4 |
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| Advertised HP | 185 hp |
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| Years | 1962 |
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What these numbers mean
| Bore/stroke character | 1.250 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,800 ft/min — conservative for a street engine |
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| Rod ratio | 2.021 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 26.9 ci |
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| Static compression | 10.25:1 — in the range that usually runs on pump premium |
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Cylinder head
| Intake valve diameter | 1.5" |
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| Exhaust valve diameter | 1.31" |
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| Chamber volume | 66.8 cc |
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| Rocker ratio | 1.56:1 |
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| Lifter type | hydraulic |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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