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It depends on what's worth it to you. Getting your heads ported and polished is expensive and I wouldn't trust any joe schmo's with my heads. The 4.6 heads can be tricky if you've never worked with them. Expect to pay anywhere from 600 to 1200 dollars for around 20rwhp. I've contemplated the idea of getting them worked when i do my cams, but I decided to save the money and just up the jets from 100 to 125.