I am just curious here but who has run them and are they a good blower for a not real radical 700-800hp BBC lake boat? The prices seem reasonable for new ones and you can get an 871 kit for about the same as a Weiand 671. What are the pro's and con's of the two or should I just forget both of them and get something else? I have a spare 454 block that I am going to start collecting parts for and would like to know if there are differences between the two since I have not seen very many Dyers around. All opinions will be greatly appreciated. Thanks.