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 valve spring loads for Chevrolet and Wraith models.
| Identifier | ExFiles\Box 126\4\ scan0182 | |
| Date | 18th June 1937 | |
| VALVE SPRING LOADS 18.6.37 CHEVROLET WRAITH Valve spring load } in closed position) 41½ lbs. ......................33 lbs. in Open position 96¾ lbs. ......................94 lbs. Bottom tappet spring } load in closed } 5½ lbs. No bottom tappet springs. position. } In open position 19 lbs. Total load closed......................47 lbs. ...................... 33 lbs. " " opened......................115¾ lbs. ...................... 94 lbs. ------- | ||