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Mine just broke off when I went to take the damn things out. I don't see how a stock one could ever come out. I have a set of LS1 pistons that a guy had the same thing happen to.
all bolts are or should be mushroomed. from carbs to TB's that sucks real bad man. if it was just the piston thatd be one thing. but that head is fairly fucked :\
kia sorrentos etc with the 3.5 liter do something similar a metal bushing for the wot butterflies flys out and does the same thing. makes a hell of a ticking noise