To use that much oil that quickly, the valve guides would have to be sloppy loose- - - - -even bad stem seals won't cause that rate of oil loss. I diagnosed one failed rebuild that was using oil about that badly- - - - - -it turned out that the rebuilder had forgotten to install the oil ring on one piston. That guy got a pretty bad case of Budweiser Fever on a regular basis! Another one (my own fault) was a re-ring job on a Rambler American flathead six that completely wore out the rings on a 2500 mile trip from California to Tennessee. By the time we arrived in Nashville, it was using 3 quarts of oil to a tank of gas. I hadn't cleaned up the cylinders properly after honing them, and the hone grit imbedded in the cylinder wall pores wore out the rings. The oil ring expanders were rubbing the cylinder walls, and the compression rings were less than half their original thickness. I'd recommend a complete teardown and inspection of the piston ring installation.
Jerry
