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).
Modification to the 20 HP Chassis valve seating, changing the angle from 15° to 45°.
| Identifier | ExFiles\Box 48\4\ Scan112 | |
| Date | 1st September 1923 | |
| X4226 BY/Shn1/DB.{Donald Bastow - Suspensions}1.9.23. C. to Hs.{Lord Ernest Hives - Chair} U.W. RE 20 HP CHASSIS - VALVE SEATING. We attach herewith blueprints of - E.52936 - Valve. E.52952 - Cylinder Head. showing the modification necessary to existing cylinder Heads E.52389 and Valves E.50157 to change the valve seating from 15° to 45°. Wor.{Arthur Wormald - General Works Manager} agrees to commence this modification immediately, and all chassis in the Works should be dealt with at once, except those actually promised for despatch. Will Works stop producing any more cylinder heads or valves to the old seating, as we shall issue immediately drawings of a new valve and cylinder head for future production. The Order No. for the above is 50938. BY/Shn. [Handwritten note in bottom right corner] 18/12.13 L.S. S2 | ||