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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 required feeler gauge blade sizes for the SS unit.

Identifier  ExFiles\Box 17\6\  Scan070
Date  8th December 1928
  
Hs.{Lord Ernest Hives - Chair}
BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce}
c. to BJ. Wor.{Arthur Wormald - General Works Manager} EFC.

X7060

RL/M8.12.28.

FEELER GAUGES. X.7060
X.7970

The feeler gauge for the SS.{S. Smith} unit we think
should have the following blades :
.004 .005 .010 .020 .025 .050

Some of the older ones, such as .018 and .030
have no meaning now, and the latter is too wide we think for
sparking plugs with the present compression pressures.

.020 and .025 are useful for ignition plugs and
many other clearances.

.004 and .005 are for valve tappet clearances
'go', and'Not go'.

.010 and .050 are useful for adding up for other
tests such as clearances on switch unit.


R.{Sir Henry Royce}
  
  


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