I think I have a bad head gasket

[TJR]

My coolant has been slowly diappearing. I've changed the radiator, thermostat, water pump (which hasn't quite sealed right), heater core, hoses, and radiator cap. Now my car isn't pulling any coolant from the overflow bottle. The level will stay the same in the bottle, but the level in the radiator will go down. I used to get a few bubles in the overflow bottle about the size of a dime after driving. My oil pressure guage does fluctuate sometimes. It will hold steady in the middle and then bounce up a little bit and come back down. That could also be the guage itself though. I don't burn much oil, less than a quart between changes.

Other observations I've made:
- I get no white smoke, or any other color of smoke
- no water in the oil
- my compression when I've checked is around 155 for all cylinders
- my plugs all look good
- I don't leak any coolant on the ground

I'm going to change my heads soon anyways, but does this sound like a head gasket?

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1989 lx notch
89,000 miles
bolt-ons,stock heads/cam
60'- 2.07, 8.90@78, 13.93@99

[This message has been edited by TJR (edited 08-11-2001).]