The main caps have an f on them. The pistons also have a stamped R.E. on them. Does this stand for replacement engine? Also the freeze plugs have these things on them saying that if they are removed the warranty is void. Is this one of those infamous gm replacement motors?
i have one that has, what looks like, a bullet shell in the freeze plug, that says "warrenty void if removed"...... we are dissasembling it now, and will be measuring it, so ill let you know if its original or a rebuilt unit
the purpose of that little badge is if the motor over heats it will fall off. and then they void the waranty on the work that shop did. it has some sort of glue that doesn't do well over a certain temp.