I need to change the head gasket, have a visible coolant leak under the exhaust manifold near cyl #5. Reading the pages in the Maint CD it is unclear if a special tool is required to access the head bolts. Also the text mentions to replace the bolts if stretched. What is the probablity of needing new bolts, or should I plan on replacing all on principle. Obviously I will inspect the head for cracks while I have it off, is there a common location that this head cracks? Thanks for the info