Can I get some feedback on this from you guys? I have an '04 XE and recently found nasty clay-like build up in my radiator. Every sign points to a blown head gasket, even though the truck has never over heated. I have begun the tear down process and have the cooling system off and have ordered all new parts. A mechanic friend of mine brought up the idea that I may have a cracked block. If this is the case I have some options...new block, new engine, and some other stuff. What are your thoughts in a direction and advice. I am a novice mechanic at best but don't have the money to pay someone else to do it, so this will be all me.