I'm curious as to what studs enter the water jackets of the heads. 68 Charger R/T, 440 original engine. I have two broken studs; Passenger side, third up from the rear and on the Driver's side: furthest aft stud. I was able to drill out the passenger side one, and may have to chase the threads with a tap to get out the remaining bolt shards, but the driver's side aft is not going well. On top of that, my bolt extractor snapped off and now that's preventing me from drilling it out straight. Problems, problems. These were luckily broken before I removed them, so it wasn't my fault. But still, I have to fix them. I'm worried about coolant leaking out of the studs. Does that passenger one enter the water jacket in the head? Does the driver's side one as well? What sealer do I use on the bolts? I heard Great Stuff was the sealer of choice but wanted to ask around. Thanks guys.

Cheers