Coolant leak from manifold studs

[Reckless Rat]

The leaks come from the threads of the manifold studs where they're screwed into the engine block as some of the drillings penetrate into the coolant gallery. The best, and usually permanent fix is to take the manifold off and then remove the offending stud and refit using some loctite. That is somewhat simplistic because often you will either shear off a stud or damage it trying to extract it. Better to be forearmed with some new replacements before tacking the job.