Block sealers and leak stoppers usually last just long enough to make
it seem like they're worth putting more in when the leaks come back.
That way, instead of just replacing the head gaskets and maybe JB
Welding the head pits NOW, you'll end up having to scrap the heads and
replacing your leak-stop clogged radiator LATER. The only sure and
true course if action is, unfortunately, it to fix the leak for real,
i.e. new gaskets and repair/replace pitted heads.

> I did however notice signs of  the
> dreaded head
> leak up there (small amount of coolant leaking).  Took to a local  mechanic
> where he put in
> some block seal.  Haven't seen a problem since.  Do those fixes  last awhile
> or will it just
> return soon?  Hope it lasts!
> james in houston
> 87 Westy
>