Joe, They will be a bolt in item on any of the adjustable stud style AMC heads. Depending on the brand, some fit AMCs better than others. Crane makes a rocker specifically for AMC. Some of the cheaper brands use a rockers for combined applications that might need a little grinding to the underside of the rocker to clear the keeper throughly. Nick Message-ID: <004001c551b0$9e050430$6501a8c0@Office1> From: "Joe Wyatt" <jwyatt@xxxxxxxxxxxxxx> To: <mail@xxxxxxxxxxxx> Subject: 360 Roller Rocker Kits Date: Thu, 5 May 2005 15:25:45 -0500 Has any one out there use roller rocker arms on the older non bridged AMC heads (70-71 #319-6291). Are they just a bolt on item or do you need to do anything special to the heads?