Jim, Do you know what the differences are between the 10.2, the 9.5 and the 8.5 are? I know the early 71 401 had the 219 heads with 58cc combustion chambers, Did AMC drop the compression to 9.5 by using a bigger combustion chamber head in late 71 and then go to different pistons to get the 8.5?? Thanks, Armand _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com