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).
List of specifications and modifications for various engine components, page 5.
| Identifier | ExFiles\Box 123\5\ scan0237 | |
| Date | 15th December 1938 | |
| -5- CRANKSHAFT. No.3 unit to have 2.75 journal crankshaft EXS.1279. Any further cranks in process of making should be held up. SPRING DRIVE. Nos.1, 2 and 3 units to include modified harmonic damper (EXS.1318/9). also EXS.1280 and 1283. VALVES & FITTINGS. Nos. 2 and 3 valve springs to EB.4373 as ordered from Tempered Spring Co. Steel push rods to PD.332 Fig. (1). Bottom washers to EB.4374. All units to have strengthened bottom tappets EB.3855/6. CYLINDER HEADS. All units to incorporate modification to transfer throat PD.292. CAMSHAFT. Nos. 2 and 3 units to have similar cam forms to B.60 - EB.4268, i.e. EB.4019/20 Inlet and Exhaust forms. EB.4021 Timing marking. Otherwise camshaft as for 8 cyl. EB.4105. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||