Bill R.....Definitely Pratts....but I believe your correct...most all the civilian -3's were Wright powered although I believe UAL ordered theirs with Pratts........Most all the Military -3's (R4D's etc)...were Pratt powered....except for the Super -3which were Wright powered although I recall seeing one or two with Pratt R2000's...(same as DC-4)....I don't recall where the restored -3 was procured from....But "Tom Davis" was active in getting that project done.......Bill.........