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Doubtful its a Rolls Royce Merlin......
A Packhard built Merlin with all the productionised improvements is more likely.
Sorry to be pedantic but there is a difference.
The P-51, in all versions other than the initial prototypes all ran either Allison V12s or Packhard Merlins....
When Packhard were designated to built the merlin they took a good long look at it and re engineered it to be much more produciton line friendly and therefore standardised.
they are therefore not necessarily as ultimately powerful but they are more reliable and interchangeable.
Rember RR at the time were not geared up to produce thousands of the things qyuickly....
The Rolls Royce version were mainly for the Spits, Mosquitoes and Lancasters and in ealrier marks the Hurricane.
Mind you some of the better Spits were Packhard powered...
On of the all time great internal combustion engines, right up there with the flat 6.....
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