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How Much stress can a 4.0 take?

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I myself have been very interested in going the supercharged route, preferably the xcharger. My question is this. This engine doesnt come from the factory supercharged, therefore probably doesnt have forged internals. How much stress from boost, heat, etc from forced induction can a stock 4.0 handle before catastrophic failure??
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obviously if you run a safe tune, and dont beat on it constantly then the lifespan will be longer. however, guys that are putting superchargers and other power adders similar are doing it for a reason, meaning that your gonna be in boost often enough to warant putting the sc on in the first place. this is the reason i havent done it yet, i dont wanna grenade my block and it seems as tho it is a likely possibility without building one with forged internals.
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