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).
Blueprint of a scrap section through an exhaust port and cylinder head.
| Identifier | ExFiles\Box 106\5\ scan0167 | |
| Date | 31th July 1936 guessed | |
| SP{Mr Spinney} 35 E.B.2794 EXH. VALVE 1.400 DIA. SCRAP SECTION THRO' EXHAUST PORT E.B. 2560 CYLINDER HEAD SCALE 1/1 | ||