Hey guys. So I tore in to my truck 409 this weekend and found this solid aluminum cam button on the front of the cam . I have never seen this done before. I bought this motor about 3 years ago but haven't tore into it till now. The motor was rebuilt by a well known builder in the area. BUT he has recently passed away. Everything inside looks great, it's been bored 30, new bearings... all the usual. Except it was built for the truck it was intended for. Low compression pistons and stock cam, so NO race car stuff. I'm just confused on why a cam button would be needed? Has anyone seen this before?