Hi Richard
Thank you for the suggestion, I was just this evening going through some possible engines and recalled seeing similar indentations and characteristics on the Freeman Field Face Book page.
I concur with your observations and would agree the most probable candidate would be the He S 011. Link below.
The example that Mike provided seems to have the elliptical shaped rods which look like they were cut either during the manufacture of the part or possibly afterwards at Freeman and possibly served some aerodynamic function. Just my opinion.
Thanks again Richard.
Vince...
https://www.facebook.com/10077655998...type=3&theater