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I did some R&D over the weekend with my spare engine. I shaved some material off the head chamber to see if that would be possible or a way to low compression. I also mentioned other ways to decompress the 1UZFE. If you have any info or methods, please let me know. I am trying to create an achives for 1UZFE. http://www.lextreme.com/decompression.htm
You removed material from the combustion chamber? (I assume you mean the cc and not the deck). They seem to be a pretty efficient design, hope you know what the hell you're doing, head porting is a very exact science, especially on a four-cam motor, but good luck, you couldn't just go with a thicker head gasket or custom pistons?
Did it just for the hell of it. Got extra engine at home. Its an experiement. Of course i can never do it at home. If it work out, it will done at a professional shop.