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So I'm down to the bare block except for the studs that hold
the head on. I've managed to remove about six of the studs
when one of them broke off clean. Naturally, I've used every
type of penetrating oil known to mankind, i.e. PB BLASTER, etc.,
with obviously little success.
Another product just recommended is KANO KROIL, so I bought
a can and will try it.
Any recommedations on how to safely remove these stubborn
studs?

You cant go wrong with good old fashioned heat!
Tim

Kroil will help, along with heating the block. I've found that "easy out" bolt removers rarely work as advertised. The last horribly stuck broken bolt I removed was by grinding the shank of the bolt carefully away from the threads and pulling what was left out of the block with tweezers.

For those that are not broken, a good stud puller works. Also, if you need to remove them and intend to replace them, a good pipe wrench can take them out as it applies more pressure on the stud as you apply torque. It also helps if you can turn them just a bit TIGHTER first, then back them off, to break the crud loose from the threads. Heat is the final solution and nearly always works.

The broken studs will require drilling, heating around them, then extracting them unless you can weld a bolt on the remainder of the broken stud, then heat around the area and crank it out.
Gary

I have removed broken bolts and studs by preheating the block area around the broken one and then welding a nut onto the remaining portion and while everything is hot, unscrewing it. Has always worked and so far never cracked a block. A US Army master welder instructor showed this method to me and he cautioned that preheating was necessary to avoid stresses in the cast iron adjacent to the part to be removed. While not a fool proof method, it has always worked for me.