HAS anyone had  coolent in oil problem  with these motors  we checked the heads under valvle covers saw no washing there   lots of coolant build up under covers  any one know if these have a oil cooler in radator  or know of head gasget leaks into valley   no trace of coolant in cylinders at all   or possible  block cracks   truck did not freeze  allways been maintaned   we also checked for the bad head casting there not on this engine   any input would be helpfull thanks

Solved my own question    head gasget failure  compleat  no leak into cylinders   Head gasget  gone from water jackits to push rod galley over entire gasget   bottom headbolts were wet when removed  dexacool ate out gasgets above all cooling jackets  both sides  heads ok   cleanup and flush  oiling  compleat    

WATCH OUT FOR THIS ONE ON ALL 4.3 5.0 5.7 GEN 3 ENGINES 

 thanks for the heads up. i have a similar problem on my gmc engine and this will probably help.

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