1993 80 series auto with 1HDt: 3inch body lift

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Engine reco'd 243k, 253k started losing water to over-flow tank: Head off, planed, valves & injectors re-seated. Lasted 5 days before losing water again: Head off another test and over haul with new injectors and thickest head gasket: Lasted 3000k & doing it again.
There is no oil in the water, it appears to only be pressurizing the cooling system, some water could be going out exhaust but no visible sign. suggestions welcome.
 
Engine reco'd 243k, 253k started losing water to over-flow tank: Head off, planed, valves & injectors re-seated. Lasted 5 days before losing water again: Head off another test and over haul with new injectors and thickest head gasket: Lasted 3000k & doing it again.
There is no oil in the water, it appears to only be pressurizing the cooling system, some water could be going out exhaust but no visible sign. suggestions welcome.
Sounds like a cracked head to me.
 
check the deck for flatness/true-ness?
 
head was cracked on mine, couldn't see it until it was mag tested.

cap is the first step though.
 
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