I ordered some parts from White Performance & Machine Company, including some 383 Stroker heads, pistons, and a rotating assembly. Everything arrived on time, and worked like I expected. Charlie, one of their contact people was a very knowledgeable person, and very good about answering my questions. Customer service is a little bit lacking, because they sometimes seem to have a hard time answering the phone. Probably because they are very busy. But overall, my experience with White Performance & Machine Company was a good one! I would definitely use them again!