Bell Never Aligned

Percentage? I'd say not near 50% failure. Probably single digits. There has been THOUSANDS of swaps of engines to bells WITHOUT alignment. This does not mean that various wear points have not been aggravated. It is a good idea to check this, especially the higher performance the build.

Think about "rebuilt short blocks" back in the day. Not just these cars, but trucks/ pickups. You get a rebuilt and you "throw" it in there and run it.