Has anyone used these? Looking for some info on them. One shop said they ran into water drilling heads for a 1/2 stud, but accufab said they only need to be opened up .030 with a reamer and shouldn't have any issues. Just wondering if maybe that shop just tried to take too much. I'm trying to save a sleeved block that had inserts for the head studs installed too high and I'm forced to use Larger stud. Any experience with these would be appreciated.