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 drawing for an inlet valve with dimensional tolerances.
| Identifier | ExFiles\Box 13\2\ 02-page147 | |
| Date | 5th October 1931 guessed | |
| Hs{Lord Ernest Hives - Chair} 372 .450R -5° .225 CHAMFER AT 45° ±2° 1.830 DIA ±.2 30° ±1/2° OTHER DIMENSIONS TO E78433 INLET VALVE [30° SEAT CARB'L 3/10] PII 1.500 DIA ±.10 1.686 DIA. ±.2 | ||