Compression in cooling

[Djdawson2 at aol.com]

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Thanks Ingo,
Unfortunately the cap isn't the culprit.  I could start the engine cold, reve
it up to around 4k, and watch it immediately release pressure.  The pressure
was quite obviously not due to heat.  The sad part was that it went through
so many expensive parts before I realized what had happened.

My hope is that it is a head gasket, and not something more serious like a
cracked head.  I'm wondering if the 20v heads have a tendancy to crack/warp
under extreme heat, or if they are fairly tough.
Thanks,
Dave