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).
Table comparing component part numbers fitted to a unit against those proposed for production.
| Identifier | ExFiles\Box 88\4\ scan0008 | |
| Date | 10th February 1933 | |
| -2- BY/SS.{S. Smith}1/N.10.2.33. Cont'd.{John DeLooze - Company Secretary} Detail. | Fitted to Unit. | Proposed for Production. ------------------------|------------------------------------------------------------------------------|------------------------------------------ Top Washer. | E.56833 | E.56833 Wedge. | E.56832 | E.56833 Bottom Washer | E.57827 | E.57827 Packing. | E.57825 | E.57825 Valve Spring. | Ex.8979 which is similar to E.58525 but free length 2.025. Load 56 lbs. | New drawing as fitted. Tappet Spring. | Hs.{Lord Ernest Hives - Chair}500 | New drawing as fitted. Push Rod. | E.56823 (.225 dia) | New drawing with corrected length. Rockers. | Inlet E.54946 Exhaust E.54947 | E.54946 E.54947 Pedestals. | E.56836 ) E.56837 ) Duralumin. E.56838 ) E.56839 ) | EB.134 ) EB.135 ) Steel EB.136 ) EB.137 ) LeC.3296. EB.138 ) Rocker Shaft. | E.54963 - 2 shafts. | EB.131 - 1 shaft. LeC.3296 Rocker Cover. | E.56609 - 2 Thumb nuts. | EB.90 - 3 Thumb nuts. LeC.3296 and 3369. BY/SS.{S. Smith} | ||