AVB, that is very interesting regarding a possible camshaft/compression release problem. When I first got the engine, both spark plugs looked the same, and the exhaust valve on the problem side had about 0.012" clearance! The problem seemed to start right around the time I adjusted the valves back down to 0.004" clearance.
I'll have to wait until the weekend to test it with a larger valve clearance again and find out for sure. I'll try adjusting the exhaust valve on that side up to 0.006" or maybe a little more, and will watch for any improvement.
Max, I'll check the fuel shut off solenoid as well when I get back to it, that's an easy one to test for. I'll check pushrods and rocker posts while I have the valve cover off to adjust valves. If I do have to pull the head off again then I'll also take a closer look at the internal parts you mentioned.
Thanks,
RLP
