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Nu, I seem to be having a similar problem. I have some kind of knock in my engine too at around 4000-5000 rpm. It has gotten progressively worse over the course of 6 months. However, the odd thing I notice is that I don't hear it until I hit those higher rpm's. After 5000 the sound goes away but comes back when I get back in that area. When revving down the sound gets notoriously louder.
I'm assuming that it's a piston knocking as well, and since I've been informed that the GA is a full contact engine, the valves could now be warped, and piston head dented severely. My question to the forum is: "What to do, replace the damaged parts or find a new engine?"
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