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Not to be argumentative but I believe my statement about squish is correct and accurate. It goes without saying that there are min/max limits to squish/quench, just as there are min/max limits to most tolerances. The OP did not seem to understand that the primary reason for the .030" head gasket was not to increase compression but to tighten up the squish area. I thought a brief and oversimplified explanation of squish and how the thinne head gasket may have helped his existing detonation problem might help.
I do understand what you were trying to communicate and that is why I indicated that I thought you were partially correct. If the quench is to big, then yes, you are fully correct and the head gaskets will make a difference. If quench is already at .030 with stok HD gaskets, then going thinnner will cause issues. Sometimes though people just go and make changes without doing all the measurements and checking required. Especially if they have already done some modifications. Some pistons stand proud of the cyls, others short, so I never make a blanket statement that changing head gaskets will improve performance, it depends on a lot of things.
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