Pontiac Ponti 1967 326 250HP Specs
Pontiac Ponti 1967 326 250HP engine specs: 326 ci (5.3L), 8-cylinder, 3.719" bore x 3.75" stroke, 9.201:1 compression.
Dimensions
| Displacement | 326 ci / 5.3 L |
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| Bore | 3.719" |
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| Stroke | 3.75" |
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| Cylinders | 8 |
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| Configuration | V8 |
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| Compression ratio | 9.201:1 |
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| Rod length | 6.625" |
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| Rod ratio | 1.767 |
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| Bore/stroke ratio | 0.992 |
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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 | 250 hp |
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| Years | 1967 |
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What these numbers mean
| Bore/stroke character | 0.992 — square — bore and stroke are within 5%, a balanced compromise |
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| Mean piston speed at 6,000 RPM | 3,750 ft/min — in the range typical of performance street engines |
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| Rod ratio | 1.767 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 40.8 ci |
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| Static compression | 9.201:1 — low by modern standards, generally happy on regular pump fuel |
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Cylinder head
| Intake valve diameter | 1.884" |
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| Exhaust valve diameter | 1.603" |
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| Chamber volume | 55 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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