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).
Performance comparison graph for a B.60 cylinder head under various configurations.
| Identifier | ExFiles\Box 134\1\ scan0171 | |
| Date | 26th May 1939 guessed | |
| B.60. CYL. HEAD COMPARISON S.102 B.60. Nº3 UNIT CAMSHAFT F.B 4332 VALVE TIMING I.O. 9° A.T. E.O. 27° B.B. I.C. 49° A.B. E.C. 11° A.T. PISTONS AEROLITE (FLUSH TOP) INDN. SYSTEM 2 - 1 1/2" S.U's ON 1.6' PIPE ① CYL. HEAD (F.B. 3844) STD. HEAD WITH THROAT INCREASED TO MAX. BY MACHINING. FACE MOD. TO P.D. 292 GIVING 6.8:1 C/R ② As ① NON-DETN. TEST BED EXH. SYSTEM. (REDLINE) ③ OPEN EXH-B.H.P. B.H.P. & B.M.E.P. R.P.M. IGNITION ADVANCE Ⓐ MIN. ADV. FOR MAX. POWER Ⓑ NON-DETN. LINE IGN. ADV. B.T.D.C. | ||