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).
Comparison of the weights of Chevrolet and Wraith valve gear components.
| Identifier | ExFiles\Box 10\3\ 03-page033 | |
| Date | 18th June 1937 | |
| 654 . 18.6.37 CHEVROLET AND WRAITH VALVE GEAR. WEIGHTS CHEVROLET WRAITH. Inlet Valve......... 3.8 ozs.........3.2 ozs. Exhaust valve....... 3.2 ozs.........3.25 " Push rods........... 3.25 "...........2.4 " Spring washers...... .66 "............0.87 " Bottom tappets...... 2.75 "...........3.44 " Rocker complete..... 5.5 "............4.6 " Total...............15.46 " Inlet Valve Mech 14.44 " ".................14.86 " Exh. " 14.5 | ||