[Dave in MN]

I have run heads like this and had no problems. If it weeps around the bolt, remove the nut and put a small amount of sealant between the nut and the head and sparingly on the threads.

I have repaired a number of these cracks by installing a cast iron guide in the hole and then spot facing the top side and surfacing the head. I ordered cast iron guides, a reamer .001" smaller than the o.d. of the guide. Drilled out the hole, reamed it, used a cotton swab to slather Red Loctite inside the hole and pressed the guide in.
After spot-facing the top, the guide is drilled out to the same size as a stock hole. Surfacing of the head is the last machining operation.

The cast iron guide with the sealant around it cuts off any water flow to the stud hole and expands at the same rate as the head with temperature change.

Good Day!