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).
Spectre Double Valve Springs for use with a short duration camshaft, noting required head modifications.
| Identifier | ExFiles\Box 96\2\ scan0014 | |
| Date | 28th September 1934 | |
| To By.{R.W. Bailey - Chief Engineer} Copy to Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} RMC 4644 357 E/PSN.1/MN.28/9/34. L.L. Smith SpectreCodename for Phantom III Double Valve Springs. We send you herewith LeC.4124 showing double valve springs for use with the short duration camshaft on the above engine. Slight pattern modifications to the head are necessary as shown but the springs are suitable for use with existing valves. E/PSN. Encl. LeC.4124. | ||