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I am wondering what's the average cost is for getting a set of w2 heads ported. I was at my local machineshop today dropping off a 383bb and he's said for a competition 5 angle valve job was $190 and to port a set of w2 to 310-325cfm would cost me around $500 and $300 for a intake.. is that a good deal?

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That's a very good price. Verify that they have experience hitting those numbers on W2s on a calibrated bench...325 out of W2s require "all out" porting and being iron heads it isn't exactly a quick process if being done by hand.

Request a flow sheet to make sure flow numbers progress at all lifts, max flow isn't important if there is reversion in flow or if the low/mid lift numbers aren't good.