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).
Performance test report for a standard head engine with the cut-out open.
| Identifier | ExFiles\Box 82\3\ scan0236 | |
| Date | 2nd May 1935 | |
| ( 2 ) 2/5/35. STANDARD HEAD Cut-out Open Max. Engine Revs......4,450 Oil Temp............115°c Water " ..............82°c Average Lap Speed.... 87.4 MPH. Small Induction Pipe. ----------------- G.W.Hancock. G.W.H. | ||