| Year | 1942 |
| Date | 24-Sep |
| Volume | 87 |
| Issue | 2,159 |
| Page | 305 |
| Category | Improving the Two-Stroke |
| Part | |
| Title | A 30-c.c. Racing Engine Design |
| Author | Edgar T.Westbury |
| Notes | Rotary valve setting, producing the groove, drilling the port, rotary valve, careful boring, a fine thread |