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Message: [QUOTE="06_Whitebull, post: 933019, member: 7022"] OP....this is what I got back from the builder. If you want to ask him specifics he is Gearhead2012 on the org. [INDENT][INDENT][B]If you were going to do studs one at a time (which I wouldn’t recommend) then it’d be hard to tell. You can compare the total head thickness to the OEM spec for minimum thickness, but measuring them accurately on the truck would be very difficult. If you pull the heads off while doing the studs anyway, you could more accurately measure the total head thickness. If the concern is valve recession, you’ll want to be deeper than about .020” or so…if you resurface them without doing other valve job work you effectively move the rocker arm closer to the lifter, thereby increasing lifter preload, and increasing the likelihood of piston to valve contact. These engines left the factory with too much lifter preload to begin with; the safest option is always a rebuild. If you’re doing all the machine work you can safely mill upwards of .008”-.010” off. If you just mill them with valves in place I wouldn’t resurface more than a couple of thousandths off, and even then, only if valve recession stays above .020” or so.[/B][/INDENT][B][/B][/INDENT] With my vast knowledge... LOL ...are you going to be upgrading injectors, the turbo, or running a hot/race tune? If not, disregard the above and you could do the 1 stud at a time, following proper torque specs and sequence. You can always talk to the tuners (I see you're running one from IDP) about what you have done and what you want and they can write the tune as best they can to keep things together. Then, you can save some money while having fun for when the, [B]IMO[/B], inevitable happens, blow gaskets and have to pull heads. Studs can be reused as long as you don't over torque them the first time. Not bashing by any means, just my experience: Stock everything, bolt safe tune, race a Camaro and [B]BAM, PUUUUKE[/B]...and $900....run! I had my spare heads cleaned, fluxed, pressure checked, and milled .003 for $260. If you are so inclined, here is some light reading about machining 6.0 heads he wrote, lots o pics... [url]http://www.powerstroke.org/forum/general-6-0l-discussion/229120-how-machine-6-0-a.html[/url] Best of luck with whatever route you go...:blitzed: [/QUOTE]