Well I would blame World more than anything, cause he has done that before, along with drilling head deck holes into the water jackets, as well as the trans holes into the water jackets, but figured I would take the high road. But this is a potential problem on any aluminum G2 Mopar block where the sleeve installer does not have a good process...I really like the newer Non-mopar dry deck blocks that have evolved to eliminate this issue. Mopar should follow.

When I worked at GM, we put the sleeves in with liquid nitrogen and a automated sleeve hammer that hammered them to the bottom...Seems the after market has not figured this out yet. It changes sound when it hits the bottom. Then we heat cycled them. Seems like a PITA process, but you don't see factory engines having that issue too often.