At one time we had a discussion concerning
replacement oil lines for the lower valve covers, since i needed to replace a line on the 47 due to age and corrosion had played its part in making the old one crack after my heavy handed attempt to reposition after replacing the guides.
a good cheap replacement is balkamp/napa part
813-1203 3/16 X 12" cut one end off debraze the old stub clean up the hole and rebraze the new line after cutting to fit, 2 ea will do 2 short and 1 long line total cost 5.00 with the tax and your tyme. course this is a depot level repair in which you have the motor out and heads removed