Can someone tell me what engine this belongs to?

Mr. Mike

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The rocker boxes seem to be more like Wrights.
The finning is relatively thick.
It's from the back row of a two row engine - the pushrods and ports are on the same side.
What is the bore? Any part numbers?
 
Pratt & Whitney R-2800-52W,-54 rear cylinder
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There are no fin restricting strips on the cylinder in the first post, so it may be earlier than the 52W/54.
 
 

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