Where do I look?

[2kvert]

Hi all. 96 4.3 lost power had water in oil. Gray milkshake.
compression check was 200 in all but cylinder 5 which is zero. Valve train looks ok
I just did rings and bearings etc last summer.
Pulled the head and found no obvious problem with gasket or head.
Thoughts?

 

[garbageguy]

Zero is bad. Cracked block? froze, or maybe overheated and warped head?

 

[alldodge]

Place a steel straight edge and feeler gauge and check for warpage across the head

 

[2kvert]

That's all I could think of too. Temp guage never read high this year, but I'm not sure how accurate it is.
ill try the straight edge and maybe run it to a machine shop to check it out further.
Thanks

 

[Bondo]

in all but cylinder 5 which is zero.

Ayuh,...... Is one of the valves rusted open,..?? Zero is hard to get,....

The others are high from the water, 'n oil,....

 

[Scott Danforth]

Any value higher than 150 psi means you either have a bad gauge, or you have water or oil in your cylinders.

150 PSI is the published cranking PSI for a new motor

 

[2kvert]

That's good to know. I thought it was high but ince I had just re ringed it , I assumed I was just awesome