Steve;
        There are a couple of possibilities here. I just replaced the
heads on "Elvis" (85 GL) and am going through a similar problem. In my
case I suspect the problem is the straight water I am running in it. The
engine runs so close to the boiling point that it is (boiling). I rigged
up a setup to test for exaust gases and it proved negative. You can buy
these kits at the better FLAPs. I recommend you try it. This would reduce
your trouble shooting to either overheating or combustion gas proiblems.
        The reason for the staright water is to flush the system and test
for combustion gases, which I did have with the old heads.

Good Luck and Drive Safely
Ken Lewis
86 Crewcab 220K+ miles
http://Neksiwel.20m.com/

On Sat, 17 Aug 2002 23:51:02 +0100 stephen de la salle
<sdelasal@PEOPLEPC.COM> writes:
> Rebuilt engine approx 4K miles ago ...... If I then let the  revs
> drop back to idle - I get a 'burb' of gas coming via the metal
> expansion tank cap to the oerflow tank.

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