Yep...Changing the T'stat does require more than a few ounces :-)
Probably a good bit of PM if your engine has serious use. Would that I could say the same.
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Capt Bob
1969 Chris Craft 23 ft Lancer "Retriever"
260HP 5.7L MERC w/Volvo outdrive
Atlantic Salt Water Flyrodders, Seaside Park, NJ