So I have done many many things to try to eliminate the 2k vibration to no avail. (To recap - the 2k vibration starts after I re-tighten head bolts a while ago)
I even have the head gasket changed again but still not resolving the issue. When I last pulled the head out, I checked flatness and it was fine. But I did not know (still don't know) enough to do valve seat\stem seal etc. After many months of troubleshooting and replacing quite a number of things, I came to the conclusion that the head is probably the cause of the problem. And I was the one that messed it up when I re-tighten the head bolts since the vibration starts right after re-tightened the bolts. I suspect I might have cause a hairline crack somewhere or distorted the valve seats. But the head was checked flat during last pull.
Eventually I want to fix the head, either get a reman one or take it to a head shop. I have found one locally that has good reviews, but I don't know how much they will charge for a complete job (valve seat, pressure test, stem seals etc). The reman one is about $400-500. But I have to assume the reman head has been restore correctly (its mail order so I can't check before getting it).
So which is the better way ? Take it to a local shop ? or order a reman ? Or anyone has a good spare A20A3 head to offer (wouldn't hurt asking)?
-AC
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