I have never figured out why they are not more popular period. I think there are way to many myths out there about them. However I am sure the biggest issue with most people is pistons. No one stocks a shelf piston for a B1, so you have an additional cost there. Or could be guys are happy with Indy and their stuff. As I have said a hundred times if you cannot make at least 800 hp with a set of B1 originals you are doing something seriously wrong.