GTV6 valve spring mess: next question

[Joe Elliott <jee@domain.elided>]

Well, I figured out how to pressurize the cylinders--my neighbor 
(former VW/Porsche/Audi mechanic, current US Mailman, and father of 
one of my childhood friends) pointed out to me that there is a tool 
for removing Schrader valves to quickly empty tires, etc.  Not only 
does this tool exist, but my family has one (thanks for pointing that 
out, dad--NOT).  So my original plan for using the hose from my 
compression gauge will work after all--vavle came right out.

Now the current dilemma:
I put ~50psi in the cylinder (at which point the ancient air 
compressor I borrowed essentially gives up), and push down on the 
spring compressor, but the valve opens.  D'oh!!  Will more pressure 
solve this problem or is there something else I need to be doing to 
separate the piece and get the spring to compress and leave the valve 
where it is??

Also, any hints on how to compress the exhaust valves?

Yes, I know I should take the head off, but when that happens I want 
to have the guides, etc. replaced, and I can't even afford a head 
gasket now.  And that brake booster doesn't look like it wants to go 
anywhere....

Thanks gang,
Joe Elliott
'82 GTV6 (not going to work tomorrow)
'73 Opel GT (not going anywhere anytime soon)
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