Those motors are very good. Some of you know my engine history but my Stage 5.25/3 408 motor has been flawless so far (since 2006). Other then a quarter size
oil stain now and then on garage floor. I have changed the
oil every 3000 miles like x good boy.
I have always anticipated "things" so I always change
oil sooner then later; put new Quickfuel 850 Carb from Levy and had Bob Reams dial it in plus Reams put new Fuel regulator, Fuel Pump and lines last year.
Found the key to keeping these toys running right are frequent inspections and mandatory nut and bolt checks. Think if I could do it over I would have put another big block and kept those conversation pipes for "look see" and discussion.
Now I am thinking I am getting too old to drive this thing hard!