Every one of themthat I ran has literally came apart inside.I went through about 5 of them, and no they were not all the same type. I tried different types as to give them a chance.Mind you this was back in the late70's. They might be better now but you know once you have a problem its sticks with you. I have never had any problems with MSD. And like Sick says there Billet stand alone is hard to beat, but walsh4nd wanted someting cheaper