I have not found a good sound pack for the Pratt and Whitney R-4360 anywhere. That is the only Pratt and Whitney radial that I do not have a good representative of for CFS2 and FS2004. There is a sound pack on Flightsim.com or Simviation for the B-36 that includes the R-4360, have checked it out, and to be totally honest....lawn mowers sound more aggressive than those engine sounds....to whiny by far.
I have plans to take Lawdog's sound pack for the R-2600 and do some remixing and other audio tweaks and come up with what I imagine a 4360 would sound like....may be way off the mark but will be better than no sound pack at all for this monster of a motor.
OBIO