Worked on a truck a few weeks ago with same problem and it was the master cyl it was not leaking down.but It was letting the fluid bypass in side the cyl.
At least take the heads to a machine shop and have them check them out for worn valve guides etc. that's a lot of work if there's something that you can't see or even know to look for and you have to do it again 6 months down the road!!!!!
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