| Year | 1930 |
| Date | 11-Sep |
| Volume | 63 |
| Issue | 1,531 |
| Page | 249 |
| Category | Internal Combustion |
| Part | |
| Title | Building an O.H.V. Petrol Engine. 1 1/4-in. Bore by 1 1/4-in. Stroke |
| Author | F.N.S. |
| Notes | Part sectional elevation, two racing boats, details of the type B6.A model petrol engine, valve timing diagram |