AJ, I was checking some of my heads to check out their squish bands, I was amazed at the different approaches to it. Some are perfectly flat, Fox's for example, except the little .15 which is concave from the outside edge all the way to the glow plug, the LA .46 glow head is beveled from the outside edge to a small chamber near the glow plug. I guess the engineers have some rhyme or reason for what they do but it sure isn't obvious.