Gotta see what the head chambers are at first. It may or maynot be the issue. 11:1 isn't high enough to cause knock. You may have a tuning issue. But if they milled them down too far, then yea, I'd maybe run a dished piston. But at that point, you'd have to think about what kind of money is going into that vs getting new heads that haven't been milled to death.
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