I should add some information conferred to me on the 912bbs about these ports:
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I have a 356 racer friend who prefers the '68 heads! He installs a pyrometer probe in each of the air injection ports, routes the signal through a 4-way switch and then to a pyrometer. He can read the exhaust temp on any single cylinder accurately. He seem to have no trouble rejetting when altitude or weather changes dictate.
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