ads, furnishedIjy the General Motors Research Cor-pcration through the courtesy of Mr.Midgley. By means of these heads itwas possible to raise the compressionratio from the value of 3.3, which isstandard for the commercial set, to 3.7and 4.5, and simultaneously bring intoaction from one to four… … 30SPARK ADVANCE 4CSPARK AOVANCe TWO PLUGS 50*5PARKADVANCE c ^ »^^ OSPAPK ADVANCE L-
Automobiles · Aeronautics
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