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Thanks for the details gents. Looks like I will keep an eye on it and steel myself to replacing the head gaskets in the Spring (if she makes it that long!). Bulldogger

Good point. We'll see. I'll watch it for a while and try to get a feel for how bad it is. Might have always been there since I woke her up from her slumber. BDGR

dilvoy, interesting about the bolts. I'd never heard of such a thing. I have seen head bolts get annealed, slightly, from heat and lose their ability to hold a good torque, but that was on an old Harley. Is there a risk tightening the GM bolts in place? I realize it's unlikely to stop the...

Thank you for the replies gentleman. I don't have the luxury of good working conditions to remove and replace heads now that the cold-weather has arrived. Are there no effective temporary fixes, or can I just leave it to weep? Bulldogger

I mentioned this in my HMMWV rebuild thread but don't think anyone noticed, so putting it out here. I've noticed what appears to be a new tiny bit of weeping between the head and block at the front left corner of the motor. Tiny, tiny bubbles when it's running. I don't think it's using up...