Maybe someone can help me out right quick...I just picked up one of these motors this last weekend,used..and about a gallon on it. Its in fantastic shape.I havent run it yet, but i did look inside it and realized it still has the 2 head shims...So i need to know...what is the size of the single shim so I can get one put in? I thought maybe I had read it further back in the post somewhere but cant seem to find it. Thanks in advanced!