Quick summary;
Engine failed at 136,000 miles due to a single lifter failure.
Full professional rebuild of engine including replacement of all 24 lifters with brand new lifters (and replaced all of the collateral damage).
Engine failed again within 500 miles of highway driving due to ... wait for it.... lifter failure.
Why? Lifter carrier was worn and excess tolerance was allowing the lifter to wobble ever so slightly. Slight wobble resulted in uneven stress causing failure.
Another full professional rebuild along with more collateral damaged parts replaced including another set of 24 brand new lifters but this time included two new lifter carriers.
Second time is the charm if you don't find the root cause of the failure on the first go around. Lesson learned.
