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).
Weight comparison table for Chevrolet and Wraith valve gear components.
| Identifier | ExFiles\Box 126\4\ scan0180 | |
| Date | 18th June 1937 | |
| 103/6 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 | ||