Hi Marty,
Without seeing the frame it is difficult to really determine if it is
repairable, never the less, I have done some BB repairs. You might see if a
local builder can
nickel/silver braze the crack (nickel silver is a high temp high strength
about 85,000 to 95,000 psi). And if necessary perhaps reinforce it with a
steel plate. It is worth, at least, having it looked at by a builder. I hope
I helped.
Anthony Mezzatesta
Mezzatesta Cycles
Cranberry Twp Pa 16066
724-778-8224