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Fastfred-
Kaisen may be about spot on. We've had a couple (my company) of the 4.7 with a mystery coolant leak initally blamed on head gaskets that turned out to be something else entirely. The walls in the cooling jackets are pretty thin. We've had them leak into the exhaust (but usually into the cylinder). It's as if the coolant is as corrosive as battery acid...
That would explain it - leak into the exhaust - not consumed in the cylinder.
angela
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Hello
http://forums.pelicanparts.com/off-topic-discussions/1102514-we-lost-amazing-woman-yesterday.html
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