WTF why 6 degrees? What does that come from? It should center on 0 on the block right? I just looked at my 318 I pulled and it is aligned with the notch as best I can see.
IDK the answer to that. I just grabbed my Fluidamper off the shelf and laid two squares on it. One through the center of the key way and the other on its edge and it lines up at 6 degrees BTDC