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Ford Model 7GA specs: 226 ci 6-cylinder, 3.30 x 4.40 in (83.8 x 111.8 mm) bore and stroke. Built 1947. Used in the Ford Ford V8 Cars (1935–1948).
The Ford Model 7GA is undersquare — the 4.4" stroke exceeds the 3.3" bore by 25.0% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.4" stroke, mean piston speed reaches 4,000 ft/min at only 5,450 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 6 cylinders displaces 37.7 ci (617 cc).
It is one of 7 engines in the Ford 226ci family, all of them 226 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 226 ci |
|---|---|
| Bore | 3.3" |
| Stroke | 4.4" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.75 |
| Fuel type | gas |
|---|---|
| Years | 1947 |
| Bore/stroke character | 0.750 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,400 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 37.7 ci |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 1947. Each year opens that model's engine table.