Just a theory: Rich running engines will have heads that are too *cold*, hence a higher temperature differential with the valve seats. Different expansion rates of the 2 metals causes seats to drop. If true, this may be of relevance to those who wish to replace their precious FI with carburators. Discuss amongst yourselves... :) -- Sami ('75 Westf.) dakhlia@wuecona.wustl.edu http://wuecon.wustl.edu/~samid/
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