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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).
The weight reduction of Phantom II inlet valves through various modifications.

Identifier  ExFiles\Box 17\6\  Scan132
Date  26th August 1933 guessed
  
WEIGHT OF PHANTOM II. INLET VALVES.

Weight of original Inlet
Valve R.83904. LeO 3446. 6.53 ozs.

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Weight of Valve with tulip
portion of head modified
to EX.11887. LeC.3579. 5.66 ozs.

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(These valves have previously
been modified by removing
step on the head adjacent to
seating).

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Weight of Valve when further
modified by drilling a .156"
diameter hole up the stem in
accordance with EX.12011 5.32 ozs.

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The figures below indicate the reduction in
weight at the different stages of modification :-

With modification to tulip
portion of head to LeC.3579
and removal of step adjacent
to seat. .87 ozs.

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By drilling stem to EX.12011 .34 ozs.

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With all modifications
incorporated. 1.21 ozs.

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