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).
Sketch showing modifications to a Japan Cylinder Head to give increased clearance around the inlet valves.
| Identifier | ExFiles\Box 102\5\ scan0097 | |
| Date | 4th November 1931 guessed | |
| BEFORE MACHINING INLET <-> 1.500 DIA MOD HEAD .350 Rd .150 1.000 Rd 1.125 Rd SKETCH SHOWING MODIFICATIONS TO JAPAN CYLINDER HEAD TO GIVE INCREASED CLEARANCE ROUND INLET VALVES | ||