Doug in CA wrote:

>Michael,
>You could try doing a leak test into the cooling system past the head
>gasket.
>Some compression testers have an air line fitting on the end to allow this.
>Bring engine up on TDC firing position for cyl#1, insert compression tester,
>attach air line with 100 psi.
>
Probably obvious but... be sure to have it in gear (1st or reverse) and
the parking brake firmly on.  Can be kind of embarrassing if you omit
setting the brake... but then who among us hasn't run over his own foot
a time ot two?

That said -- I would bet money it is the head gasket and as Doug said
sniffing the air in that tank is the definitive test.

Geo Hahn
84 Westy
Mt Lemmon, AZ