Butchman,

I just thought of one other possibility. I read a while back, another member mentioned that they had a leak that was causing coolant to leak directly onto the engine, so you would never see a leak, as the engine would evaporate all of the leak. This, I believe, was caused by one of the heater hoses where it is connected to the block. I would get up underneath the car and have a good look for crusty signs of antifreeze and you may be able to track a leak back to a hose clamp, or something simple.

Head gasket failure is not common on the whiteblocks, so that would be my last thought, and you would definitely see quite a bit of white smoke coming out of the tail pipe if it were a head gasket.

BB