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).
Material composition analysis for an aluminium head with direct valve seats, referencing Alfa Romeo cylinder castings.
| Identifier | ExFiles\Box 124\5\ scan0084 | |
| Date | 9th July 1932 guessed | |
| Aluminium Head with direct valve seats- Silicon 4.85 Copper 6.7 Magnesium .86 Iron .57 Zinc .19 Nickel Trace Manganese 0 Aluminium remainder Alfa Romeo cyl: castings. | ||