Reply To: Big twin service bulletin

[trex014]

Bob, I’m familiar with that thread and checked it over again but I’m looking for info about drilling a hole in the copper water tube itself, I think I remember it being a 1/16″ hole but I’m not sure where it is supposed to be on the tube and what it’s supposed to cool. I’m 99% sure it was for the mid-late 50’s big twins but maybe I am thinking of the 40hp bulletin.