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).
Secret memo detailing modified valve rockers for the Wraith III model to suit a reduced cam lift.
| Identifier | ExFiles\Box 10\3\ 03-page013 | |
| Date | 3rd March 1937 | |
| Piles Swift 654 DX c. Rm.{William Robotham - Chief Engineer} HPS{Horace Percy Smith - Experimental Factory Mgr} SECRET. E/JNR.{Charles L. Jenner}1/HP.3.3.37. Wraith III Valve Rockers. We send you herewith:- LeC.5543 showing the modified rockers to suit the cam lift which has been reduced from .300 to .275. This drawing cancels LeC.5505. E/JNR.{Charles L. Jenner} | ||