I've been asked to weld two 6V71 supercharger cases together (end to end) to efectively get a 12V71. The owner of them says he can couple the rotors and I only have to join the cases. My main concern would be warpage causing misalignment, which would pretty much stuff the blowers. I know I can bolt them to heavy plate while they're being welded but still have concerns. Has anyone ever done this, or seen or heard of it being done sucessfully? Do you think dowelling and bolting the cases together would be better?