Any chance that you have compression getting into the cooling system? Cracked head, leaking head gasket, cracked block. This scenario will make an engine OH in short order depending on how bad the leak is.
The rock hard hose comment could be a symptom of this problem.
With a pressure tester the cooling system should hold pressure for 5-10 minutes without a significant drop.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
Last edited by Sirrotica; 10-16-2019 at 07:14 AM.
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