Pontiac 370ci 8.6:1 Specs
Pontiac Pontiac 370ci · 4.063" × 3.563" · 8.6:1 engine specs: 370 ci (6.1L), 8-cylinder, 4.063" bore x 3.563" stroke, 8.6:1 compression.
Dimensions
| Displacement | 370 ci / 6.1 L |
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| Bore | 4.063" |
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| Stroke | 3.563" |
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| Cylinders | 8 |
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| Compression ratio | 8.6:1 |
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| Rod length | 6.625" |
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| Rod ratio | 1.859 |
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| Bore/stroke ratio | 1.14 |
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| Piston deck clearance | 0" |
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Construction
| Induction | 1-2 |
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| Advertised HP | 240 hp |
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| Years | 1958 |
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What these numbers mean
| Bore/stroke character | 1.140 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 3,563 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.859 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 46.3 ci |
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| Static compression | 8.6:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.88" |
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| Exhaust valve diameter | 1.6" |
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| Chamber volume | 70.2 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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