AAF Materiel Command Design MCD 392 (MX-423)

I should add that at least one example of the Allison V-3420 engine proposed for use in the MCD 392--a combined pair of 'standard' V-1710 engine blocks--still exists. Photos were recently published on Hyperscale.com showing the engine on display at the most recent air races in Reno, Nevada.
 

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If memory serves, there is also a V3420 at the RR museum in Derby
 

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