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Just to add some information to this thread.
J&E 3.4L Pistons have gone through 3 revisions and the new design is not bad but pretty much anything pre-2009 is going to fail. The originals will fail in short order and usually at high RPM meaning catastrophic engine damage. If I had these in my car I would spend the money now to tear it apart and remove them. If you do not know what you have in your car then tear it apart and replace the pistons. The fail rate of the early pistons is 100% I have seen atleast 10 failures. All of them have caused serious block damage as a result. I know they attempted to fix the problem on the piston by moving the oil galley machining on the original forging away from the thin spot at the wrist pin. It did not work so even the 2nd generation pistons fail that being said they might be alright for normal street use. The 3rd generation of this piston is an entirely different forging and they are strong as hell completely redesigned and if they fail it is the result of a poor build/tuning.
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