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Message: [QUOTE="Gearhead2012, post: 831732, member: 12934"] The castings vary so much we deemed it was too dangerous to take much out with a CNC program. Im not doubting you, im actually glad to hear someone went through the trouble to do it. What kind of CNC machine do you have? Rottler, RMC, or what's that other one...centi-something? What's do y'all charge for the process...and how do y'all get around the casting inconsistencies? Do you have flow data before and after? And how do you check the wall thickness after porting? Again not being skeptical, just curious...I haven't heard of but maybe one other shop that actually went through and developed a CNC program, and they said it was a nightmare. Yeah the heads crack...and sure people have made huge numbers without port work...but the heads crack on the valve seat (easily fixed 90% of the time with a valve seat insert) and they crack in the injector cup/fuel passage area, making them junk...some choose try to fix this, but we deemed it was too much of a liability to worry about saving a 150-200 dollar head. I'm not saying that if everyone ports their heads they'll make another 200 HP to the ground, but clearly the heads aren't exactly stellar the way they are stock, there's room for improvement. Most performance shops across thr country I've talked to have said they gained between 35-75 rwhp...hard to know how much of that is true, and how accurate they tested the port work independent of other mods. I'd be very curious to see what Jared at RCD says about their work. I know that if while I had my heads off (which unfortunately is common for 6.0 owners) I could spend an extra 6-800 bucks for 60+ rwhp and drop egt's considerably that would be a good investment. That'd put a lot of 175 guys closer to the 600 mark, and a lot of 190-205 guys closer to the 700 hp mark, all things being equal. Don't hold me to those numbers....just making an example. Will it work? Is it worth it? That's why I started pursuing this option to find out, I'm going run a set on my truck for sure, if it works out, and proves to be worth the cost then perhaps other people looking for heads would be inclined to include port work in their build. I know I'm no where near first to begin porting 6.0 heads...and I think lots of the horror stories you hear of is some 17 year old with a grinder in his moms garage who has no idea what he's doing...or even worse...some speed shop with "their guy" who is a self proclaimed porting wizard and knows nothing of the 6.0 or for that matter diesel world. I know shops like warren diesel and others have had success with port work, and I've had lots of guys ask me about it on some heads I've done on the side, that's why I'm venturing down this path... to each their own. [/QUOTE]