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 block dimensions of a 6-cylinder Sleeve Valve engine with a Big Bore Bentley engine.
| Identifier | ExFiles\Box 133\2\ scan0171 | |
| Date | 14th April 1936 | |
| BENTLEY 26.5 SLEEVE VALVE 29.0 FIG. 2. 6 CYL. 3.5 BORE S/V.{VIENNA} ENGINE COMPARED WITH BIG BORE BENTLEY. 14.4.36 HS.{Lord Ernest Hives - Chair} 2065 | ||