OK, guys, like Paul Harvey says, here's the "rest of the story", at least as I remember it! During the Korean war, (Remember that one, the first war we lost!) most of the high-quality gasoline we were producing was going into aircraft fuel. The stuff available on the domestic market was causing engines to carbon up the valve stems, especially the newly-introduced Olds and Cadillac overhead valve V-8's. Aviex, Casite, Wynn's, and a few other additive makers developed an "upper cylinder lube", basically a lightweight solvent/oil mix that was metered into the intake through a piece of 1/16" diameter copper tubing with a needle valve like an idle mixture screw to regulate the flow. It supposedly prevented the carbon from sticking to the valve stems. My father's shop sold those kits, and the oil to refill them. The reservoir was a glass jar with about a 1/2 gallon capacity, and it needed to be refilled about once every couple of months. The most effective of the brands was Aviex, IMHO.
Jerry
