Add stop leak to fix head leaks and replace all the heat exchangers
(radiator, heater cores) the next year.  (Ask me how I know...)  If
you live somewhere where the temps never rise above 85 deg f, you
might pull it off, but if the van will ever see long hills and high
temps it's penny wise and pound foolish. Fix it right.

Jim Arnott
WetWesties
Union, OR