... never saw my W5 head that I tried to have repaired did you. Some aluminum..... well, isn't.
Isnt that the truth... my first set had so much crap in the alum that it was useless to even try... when I got my replacement set from mopar they said I could keep them... I tried to weld on them..what a joke.... the set I have now is pretty porous but seal.. with some work
... never saw my W5 head that I tried to have repaired did you. Some aluminum..... well, isn't. 
