Yep, that is where it is cracked. I guess there is a part number that supercedes this one as there were many warranty replacements. They also suggest...
I've seen a few of them, they were crack in the exhaust port into the water jacket near the valve guide. Is that where yours is leaking .. ??? (just...
I kind of like the cone centering idea. Takes the splines or taper out of the equation. Only machine I can think of with a small enough arbor to fit...