There are a lot of posts on this as this is a common problem. You MUST have the head milled and make sure the block surface is extra clean from past gasket material. Check for warpage and cracks on the block surface as well as the head. Overlooking this could cause another BHG. You will be replacing more than just the head gasket, i.e. the EGR gaskets. Buy a gasket kit. Keep track of the bolts, and take notice what connectors go where. Have patience. Good luck
