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).
Blueprint comparing the cylinder blocks of a 6-cylinder 3.5 bore Sleeve Valve engine and a Big Bore Bentley engine.
| Identifier | ExFiles\Box 127\3\ scan0242 | |
| Date | 18th June 1935 | |
| BENTLEY 26.5 SLEEVE VALVE 29.0 FIG 2. 6 CYL. 3.5 BORE S/V.{VIENNA} ENGINE COMPARED WITH BIG BORE BENTLEY. ROLLS-ROYCE LTD PRINT ROOM JUN 18 1935 DERBY. Hs.{Lord Ernest Hives - Chair} 2065 | ||