Main Studs??

Challenger 340 is correct. Ive owned and operated a machine shop for some time, and believe me, they all distort! One thing I will add to this is that Ive noticed that the BB mopar isn't as prone to distortion due to the quality structure built around the mains. The small block is horrible, whereas the crank is "hanging" outside the lower panrail. They almost always need align honing. Just my 2 cents