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).
Two graphs comparing high lift and low lift cam profiles, with the lower graph identified as exhaust cams.
| Identifier | ExFiles\Box 180\M3\M3.4\ img034 | |
| Date | 17th September 1924 | |
| HIGH LIFT .432" LOW LIFT .413" LIFT IN THOUSANDTHS OF AN INCH T.D.C. CRANKSHAFT DEGREES EXHAUST CAMS HIGH LIFT .434" LOW LIFT .416" T.D.C. CRANKSHAFT DEGREES G.H.F. 17.9.24. | ||