Reply to "Call for help 1 hour North of the SanFrancisco Bay Area (Santa Rosa)"

I've heard of this before too, i.e., the race teams using stop leak as a precaution.

Iron heads had (still do) have the reputation of developing leaks int the valve ports because they have been maxed out by porting and the walls left thin as a result.

It's ok to use as long as the leaks are small and you aren't clogging up the flow tubes in the radiators with the stuff.

I'd use it for now, do a major flush job when you do the cooling system?

The only thing left to worry about then would be the engine and the heater core.

You are going to change everything else out anyway with majority of the material getting cleaned out.