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).
Total mileage of pistons and liners for chassis No. 34-EX.
| Identifier | ExFiles\Box 114\4\ scan0110 | |
| Date | 6th May 1937 | |
| 88 Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls} from Mx{John H Maddocks - Chief Proving Officer} 1011 Mx{John H Maddocks - Chief Proving Officer}19/T6.5.37 re. Chassis No. 34-EX - Pistons & Liners. The present set of liners and pistons were fitted in this car after it had run 11,000 miles. These pistons and liners had previously run 8000 miles in an engine on the test bed. This means that these pistons have run approximately 40,000 miles. [signature] | ||