Originally Posted by
Jhieminga
There is an official Rolls-Royce modification to change the Griffon 58 from Shackleton configuration to fit in a Spitfire. The structural changes you mentioned are part of it but they also have to modify the carburettor settings to allow for a much lower idle rpm than the Shack ever used. I had the PDF that detailed the changes at one point but lost it somehow.
I have the full manual for it
