Quote:
Originally Posted by animalchen
I'm able to see the valves closed on the lower ports but having trouble seeing the top ports clearly. Not sure if safe to blast. Any tips?
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Yes, it is basically impossible to see the upper port valves with a bore scope when they are still dirty.
The good thing is that they are always in sync with the tangential port valves. So if you have a good closed valved in the lower port, the corresponding upper port is closed as well.