Is this hole in the block supposed to be pluged?

Hey guys, just wondering if this hole is supposed to be pluged or not? I have a slight oil leak somewhere back there, i believe its just the rear of the lower intake.. But im curious about that threaded hole, what is it used for?


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On my FRPP M-6009-B50 short block (explorer short block), that hole goes all the way through into the bellhousing. I used it to attach a ground strap for the heater core. I think it's threaded as 7/16" NC.