I have a question about the so-called emissions ports in the Dauntless V6 cylinder heads. I'd previously thought that these ports were present on the later V6's, as opposed to the early ones. However, when I posted these photos yesterday Factory Engine Bay Photos?, I noticed that this very original unmolested V6 (with less than 3k miles on it) that dates from late 1965 has these port plugs. Apparently all the Dauntless heads had them - but 1965 was several years before emission control measures were required on American cars. These ports were probably a hold-over from Buick's early 1960's design, but why would emissions ports have been present at such an early time frame?