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).
Scrap section view of a cylinder head's exhaust port and valve assembly.
| Identifier | ExFiles\Box 106\5\ scan0168 | |
| Date | 31th July 1936 guessed | |
| SP{Mr Spinney} 36 E60893 Exh. VALVE 1.225 DIA. SCRAP SECTION THRO' EXHAUST PORT E60891 CYLINDER HEAD SCALE 1/1 | ||