Join Date: Apr 2008
Location: Virginia Beach, VA
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The first post sounds like EGR... I'm basing this on the notion that you lost a gallon rather quickly. I believe if you pull the EGR valve and look inside the manifold, it may appear moist... especially if you're able to park in a manner that elevates the rear of the truck so any coolant in the manifold flows to the front. This will help you determine if the EGR is bad. The question is, why did it go bad? I would guess your oil cooler is clogged but if you have a monitor, you would've caught wind of theis with your oil and coolant temps.
To the second post, I would guess you have bad HG's but once again, the question is 'why'? Generally, a bad oil cooler will cause the coolant in EGR to become superheated which then doesn't flow well enough into heads. When the heads get too hot, they expand and the Tyorque To Yield (TTY) bolts don't have enough tensil strength to maintain their load allowing for the HG's to get damaged. If you caught the problem early, it might just be a HG job however if this has gone on for a while, there's a chance the heads are warped and then your talking more money. I think a HG job will be around $4,000 but I've seen it done for less. Best bet is to get ARP head studs as they're much stronger than the TTY bolts.
Hope this helps. I'm sure some other folks will chime in here.