[Bigmon]

Originally Posted by enobeenob

It could be a head gasket starting to go bad, check the outside of the engine block for dried coolant leaking from the sides of the head drying up on the engine block. ?

I have a Series 60 that I noticed a little dried coolant on the front right side of the block. It was about 1/8" wide and a couple inches long. Detroit guy on the phone said it's most likely a loose clamp or hose, but can't tell until he see's it. If it is a head gasket how long do you think it will last?

[duck]

No one can say for certain how long something will last like that. Find a shop with either a dyno or someone well versed in the 60 series.