Truck Repair: N14 piston specs, piston rings, oil consumption

Question
The engine has 600000 on it.  I am currently replacing the heads do to some fuel in the coolant.  I am worried that the fuel got to the pistons and ate the piston rings.  But I have not noticed any coolant in oil.
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-----Question-----
Hey,
I am trying to find specs on pistons for a n14 435hp.  I have bad oil consumption and feel time for an overhaul.  What would the pistons look like if they are past manufacturers suggested wear life?
-----Answer-----
Personally I have checked only a few sets for reuse.They have a gauge set "tool" go-no go for checking pistons.Mostly it is only because of they were replacing the block or liners.I would purchase some of these just to check the pistons for reuse or change the liners.Oil consumption could be caused by other things besides ring wear like leaks,turbo,& air compressor.How many miles are on the engine?


Answer
Mainly the problem with pistons is heat cracks.I would clean them in hot soapy water(if blast cabinet is not available) put new liners & rings in it because all the newer engines have a steel insert for the compression rings and only get worn when dirt enters the engine.