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).
Modification to a cylinder head to increase capacity and reduce valve head diameter.
| Identifier | ExFiles\Box 90a\2\ Scan108 | |
| Date | 25th September 1934 | |
| Hs.{Lord Ernest Hives - Chair} 1527 C OF VALVE .900R .200 IN CONJUNCTION WITH THIS MOD. THE VALVE HEADS WERE REDUCED IN DIA. BY .050 FITTED TO B.II UNIT. FOR E.R.HALL 24-9-34 ROLLS-ROYCE, LTD PRINT ROOM 25 SEP 1934 DERBY. NOTE: AFTER MACHINING COMBN. SPACE: MACHINE FACE TO GIVE CAPACITY 65cc. .050 R.{Sir Henry Royce} MOD. TO CYL. HEAD. E.X. 15392. | ||