292 cylinder head mystery bolt

[pseigmund]

Hi All,

Does anyone know what goes in the bolt hole at the very rear of the cylinder head of a 292 (off a 1970, 3/4 ton). When I recently put the motor back in the truck, I thought it was for a bracket and left it alone (no bolt in it or anything). I have been trying to get my truck running and it started dumping some engine oil from the back of the value cover. I was wondering if it could have been coming from this bolt hole. In the attached pic, I put a bolt in it with some lock washers.

Thanks for any help.