okay, i was writing while you two, jim, pete, were posting. I can truly say that i really appreciate you guys, and others....personalizing my dilemma. so, tell me, when I pull the head, what should i look for? what is the operation to detect a crack that may not be evident to the naked eye? thanks again, rob.

American in Mexico with my 76 CJ7,4.6 Liter I6
Weber 32/36,Header,FlowMaster,DUI Ignition
3"Lift,33's,TH400 Tranny/Dana 20