Help identify F6F-5 Hellcat wreckage piece

[MissingAirCrew.com]

The following piece of wreckage from an F6F-5 Hellcat was located at a crash site on Yap Island. Can someone help identify this piece of wreckage? It looks be made of stainless steal and was very heavy (25 pounds). Please see the following pictures.





Additional pictures from this crash site can be located at: http://www.missingaircrew.com/trip/american1/

Any help would be greatly appreciated.

Respectfully,

-Pat
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[Forgotten Field]

Did F6F have cartridge starters? Might be the starter plenum for a cartridge starter.