Right now these advance slots are setting at .470. This distributor came with the rebuilt engine. I can tell it was cheaply made. Whoever put the distributor together somehow managed to get both roll pins in the reluctor pin holes. LOL Was a pain getting reluctor off. It raises another question as to what hole should the roll pin be located in. the hole that is even with tooth or the hole that is off a little from the tooth. bb engine. My personal engine it is in the offset hole. a buddy of mine has 2 distributors and one is even with tooth and the other offset, Lol