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The same engine also has a main page: Ford 240 Six.
Ford 240 Six specs: 240 ci 6-cylinder, 4.00 x 3.18 in (101.6 x 80.8 mm) bore and stroke. OHV, cast iron block. Rod ratio and piston speed worked out.
The Ford 240 Six is oversquare — the 4" bore exceeds the 3.18" stroke by 25.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.18" stroke does not reach 4,000 ft/min of mean piston speed until about 7,550 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 40.0 ci (655 cc).
It is one of 7 engines in the 240/300 Big Six family, the smallest at 240 ci.
| Displacement | 240 ci |
|---|---|
| Bore | 4" |
| Stroke | 3.18" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.258 |
| Piston deck clearance | 0.0018" |
| Block material | cast iron |
|---|---|
| Valvetrain | OHV |
| Fuel type | gas |
| Bore/stroke character | 1.258 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,180 ft/min — conservative for a street engine |
| Displacement per cylinder | 40.0 ci |
| Intake valve diameter | 1.787" |
|---|---|
| Exhaust valve diameter | 1.566" |
| Chamber volume | 66 cc |
| Rocker ratio | 1.61:1 |
| Lifter type | hydraulic |
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