need good heads
I think you'll have to have them made. Even if you machine the life out of them I wouldn't expect much without cam, headers , tuner and possibly an injector change. It woulb be cheaper to swap in a 4.0. 3 liters is too damn small to gain a lot in one place, heads, cam etc. The taurus sho moter swap would be good for about 20 hp, and it's a twin overhead cam engine , with more stroke. You can get that much more power with e-fan, underdrive pulley and tuner for $600.
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