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Im currently Running 13psi in my twin turbo 99 c5, its currently making 722whp and Im wanting to go ahead and get closer to 900hp, My engine is a ls2 bored to a 408 stroker with the Lq9 heads, it is studded and torqued to around 90ft lbs, So my queston is how much boost could I safely run before I have to worry about lifting the heads, Im hoping to be able to atleast get 18psi safely. Im also spraying meth. And my CR should be around 9:1.