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I've got a 87 Grand Prix that i've been tooling on for a while. I've finally come to the realization that no matter how much work i do to the 305 it's not cutting it. I've got a complete spohn and eibach suspension under the GP. It handles like a dream and with a few measured adjustments it can...

question pretty much says it all. On a stock bottom end, how much boost can a 6.0l vortec motor withstand?