[ercoupe-tech] crancase mystery

[claveled]

Anyone,
My 75hp serial #4021 415C crankcase has a plate over the hole fwd. on the 
bottom, where what I believe should accomdate a vacuum pump. However, There is 
nothing in there to drive a pump. Just a bearing cap.
Wondering if the case might have come from an 0-200. The engine has 800 plus 
hours since majored. Any Ideas. Thanks.
Ed
N3396H