Actually Tshirt, the Pratt&Whitney R4360 (Wasp Major) was specifically developed for the Consolidated-Vultee (Convair) B-36. The only civil type that used this engine was the Boeing 377 Stratocruiser.
The largest CurtisWright R3350 turbo-compound engine fitted to the DC-7 was rated at 3400 hp (DC-7C, R3350EA4). In addition, the P&W 4360 was never considered for the Douglas DC-7 series, at least according to the engineering project manager for the DC6/7. Knew him well.
Last edited by 411A; 5th Feb 2003 at 04:01.