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Dart ls1 heads are like $850 and flow as well or better then any ported stock ls1 head but have generally a 5-10% smaller intake port which will keep velocity up=more tq for the same cfm flowed. They come with single springs but duals can be had for $200-250 if you want the added protection...go with a cam in the high 220's duration and 600ish lift on a 112-113lsa and you'll make more power, have a better tq curve & be just as driveable or better then that setup.
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