Ford 1975 171 97HP Specs
Ford 1975 171 97HP engine specs: 171 ci (2.8L), 6-cylinder, 3.661" bore x 2.7" stroke, 9.872:1 compression.
Dimensions
| Displacement | 171 ci / 2.8 L |
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| Bore | 3.661" |
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| Stroke | 2.7" |
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| Cylinders | 6 |
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| Configuration | I6 |
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| Compression ratio | 9.872:1 |
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| Rod length | 5.14" |
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| Rod ratio | 1.904 |
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| Bore/stroke ratio | 1.356 |
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| Piston deck clearance | 0.01" |
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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 | 97 hp |
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| Years | 1975 |
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What these numbers mean
| Bore/stroke character | 1.356 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,700 ft/min — conservative for a street engine |
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| Rod ratio | 1.904 — long — less side loading on the cylinder wall, favours high RPM |
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| Displacement per cylinder | 28.5 ci |
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| Static compression | 9.872:1 — in the range that usually runs on pump premium |
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Cylinder head
| Intake valve diameter | 1.569" |
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| Exhaust valve diameter | 1.268" |
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Similar engines
Source: NHRA blueprints — nhra.net blueprints
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