chip - 2 things - that article talks about lifter bore clearance - that engine might have had one lifter that was sloppy - also it does sound to me like the metal does get 'impregnated' w/ ZDDP with an initial period of use
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics