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 detailing modifications to an inlet valve and port for a high power head.
| Identifier | ExFiles\Box 133\1\ scan0094 | |
| Date | 30th July 1934 guessed | |
| - HIGH POWER HEAD -, -SCT 37-, - MODIFICATIONS TO INLET VALVE AND PORT -, 1.950, 1.625, .187"R, .150", .225"R, .750"R, 1.000"R, .550"R, 1.750"R, .125"R, .100"R, 1.850", 1.950" | ||