I'm replacing the head gasket on my '85 Toyota and while I was cleaning the head I noticed a small crack in the block. The crack runs between two coolant passageways behind (closet to the cylinders) the head bolt on the exhaust side between the number 4 and 5 cylinders.
I see no signs of a leak near the crack. I checked the old head gasket and noticed "bumps" where the gasket filled the crack before leading me to believe the crack was there the last time the head gasket was changed, which was a couple of years ago and several thousand miles.
(The car has a leaky radiator and has been overheated a couple of times).
The gasket is being replaced because it was overheated and blew the gasket behind the number 6 cylinder between the cylinder and a coolant passageway. Not really near the crack.
So my question is: Is this block usable or should I find a new one.