biggrizzly wrote:
Another challenging bolt. It is supposed to be a 15mm IIRC however the flats of the factory banjo bolts are cut at an angle and very difficult to get a socket to stay on.

This is what I did... You will get a kick out of this.

I left the crossover tube on the heads and pulled both heads off together. Then removed the banjo bolts with the heads on the bench. I didn't even bend the tube. And I pulled them off by myself too. That was interesting to say the least. IIRC I butchered them up pretty good getting them off after 150K miles. I replaced them with new ones GM Parts direct. However I think they are Out of Stock now, but you might want to check.