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Guys, my machinist kinda left me hanging on this one. Took in a set of bb heads for rework and ask him to repair a broken off exhaust stud , one on the end in the water jacket. He only drilled out the broken stud.Loading up everything I forgot to check, so just found it on assembly day. So, do they make an one sided oversize stud, maybe something like a 7/16 by 3/8 fine thread. I am concerned putting in a heli coil with a stock size stud may be hard to prevent a coolant leak. Want to fix this now before getting the engine in the car. thanks....