[christianchevell]

#1 do not expect miracles from just ported heads, they are of course very similar to stock which flows plenty to support 600 rwhp already flowing numbers like ported BBC heads of yesteryear..... I just used GMPP heads factory for about 1300.... and did lots of research about different shops porting and found for a couple hp....you could pay ridiculously more, I did read for stockers Dickey Scoggins made up some for a decent price also.
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Factory CNC versus others there is not much meat on the bone IMO, now if you doing up a full race with mast ls7 small bore heads for 4 grand done up by Frankenstein with a 750 lift cam on something well ...that's a whole different ball park.