[scottj]

I had the same thing happen on my first aluminum block. I was not aware that the block used a special stud with 1.75" of thread that bottoms in the hole. The standard stud pulled a chunk of the block out between cylinders. I used the argument that since they included a list of required special components with the block, the studs should have been listed. The Chevrolet Racing dept ended up raplacing the block.