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).
Photograph of a high power aluminium cylinder head with an inserted valve seat and a separate inlet valve.
| Identifier | ExFiles\Box 134\2\ scan0153 | |
| Date | 23th August 1937 guessed | |
| No.3. HIGH POWER HEAD. Inlet valve 1.850" diameter - Inserted valve seat. Material - Aluminium. | ||