The one I had that was externally balanced was my euro 280e. There were husband marks on the fw and crank but they were very very light like a hologram and it took the young sharp eyes of my favorite machinist's son to spot them. I could hardly see them at all even after he pointed them out to me.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.