Pontiac 316ci 8.9:1 Specs
Pontiac Pontiac 316ci · 3.938" × 3.25" · 8.9:1 engine specs: 316 ci (5.2L), 8-cylinder, 3.938" bore x 3.25" stroke, 8.9:1 compression.
Dimensions
| Displacement | 316 ci / 5.2 L |
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| Bore | 3.938" |
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| Stroke | 3.25" |
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| Cylinders | 8 |
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| Compression ratio | 8.9:1 |
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| Rod length | 6.625" |
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| Rod ratio | 2.038 |
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| Bore/stroke ratio | 1.212 |
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| Piston deck clearance | 0" |
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Construction
| Induction | 1-2 |
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| Advertised HP | 205 hp |
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| Years | 1956 |
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What these numbers mean
| Bore/stroke character | 1.212 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,250 ft/min — conservative for a street engine |
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| Rod ratio | 2.038 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 39.5 ci |
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| Static compression | 8.9:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.78" |
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| Exhaust valve diameter | 1.5" |
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| Chamber volume | 69.6 cc |
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| Rocker ratio | 1.5:1 |
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| Lifter type | hydraulic |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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