From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Hand-drawn sketch with annotations for a valve assembly modification.
| Identifier | ExFiles\Box 124\3\ scan0078 | |
| Date | 5th January 1920 guessed | |
| This dimension & also overall length of valve to be .025 shorter so that spring will remain as now, but rocker will come round a bit. We want some more adjustment here hence shorter valve stem reqd. | ||