ORIGINAL: DarZeelon
It is true many tapered-bore engines will sustain no real damage, perhaps even none at all, from a four-stroking, rich break-in, as Brian wrote in the thread referred to, in post #5.
And also, this type of break-in (hot) will be completed faster, with much less fuel waste.
Dar
It's good to see you've changed your ideas away from your original doomsday prophecies of "Run it rich for even one tank and you might as well throw away your engine" as I well recall you telling one newcomer.
Maybe it's worth repeating that my experiment wasn't to say an ABC should (or could) be run in slobbering rich but only to find out what damage might be caused instead of just going BAAA BAAAAA and following the sheep.