Good info, Widewing. While we are on the subject of Mustang engines, why was the P-51 never fitted with the Griffin engine like the Spit XIV was?
Griffon engine manufacture was small scale [~8,000 made in total] - compared to Merlin.
& the Spitfire XIV really needed its bigger Griffon mill to make speed like the aero-slick Mustang .
Later model Mustang `51H fitted the hi-po Merlin V-1650-9 - which made 2,200+hp on ADI,
& so the Griffon wasn't really needed, even if it had been available..