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).
Specification list for various engine components, page 2.
| Identifier | ExFiles\Box 92\6\ scan0138 | |
| Date | 9th April 1937 | |
| Sg.{Arthur F. Sidgreaves - MD} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} -2- Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls}1/R.9.4.37. (e) Solid Tappets. (f) Special Camshaft. (g) 4 port 6.5 C/R deturbulated cyl. heads. (h) No oil cooler or pressure filters. (i) Strap type connecting rods. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||