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).
Continued note regarding standard material for car and aero engine valve stems.
| Identifier | ExFiles\Box 154a\1\ scan0068 | |
| Date | 2nd February 1928 guessed | |
| contd :- -2- These will be made of our usual standard material. Our types of both car and aero engines have less shock load on the valve stems than any other type we know for a given speed. R. {Sir Henry Royce} | ||