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The PSI on cylinder 6 should be much higher. over 100. I would check the compression again, just to confirm. You could also pull the valve cover to see if there is any obvious damage to the valves on cylinder 6.
However, at 150k miles, a head rework is not really a good investment. Sorry to say that while it is possible to fix valve damage, it is not financially a good move. Removing, rebuilding, and re-installing a head is not a DIY level type job.
If the damage is in the cylinder wall, the engine is done for.
Sorry to give you bad news, I hope that this can help.
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bone stock
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