I am rebuilding my California 1976 spitfire's engine and considering using Moss's HC flat top pistons instead of the LC (dished) ones. I have been told that I risk failing the NOx smog test max requirement. I understand that this is due to the combustion chamber's temperature potentially exceeding 2500 degrees , which generates NOx. Assuming the EGR to function perfectly and the fuel mixture to a bit rich, is this still potentially a high risk problem? There must be a few a guys out there that have been tempted to do this to get the nearly 20 extra hp. That is so badly needed. _______________________________________________
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