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Message: [QUOTE="Black AOD, post: 1476080, member: 16536"] OP, Ron and Shane have already given you a great lengths of info on what you'll need....my .02 is this. To make 750-800HP you will need dual fuelers. Period. That's been stated. Your best bet is to do stock appearing 75/59 from RCD or 76/59 from Elite Diesel and some 60% Injectors also from RCD would be my recommendation. Heads need decked and magnafluxed, period. O-ring them while they are apart, do a set of new never torqued studs, I personally would make sure the torque spec is 230 or below on a set of nice high tensile strength studs. OEM gaskets are my preference. Pushrods and valve springs are a must, if you can find a good reputable machine shop, doing hardened valve seats is a very good idea. Porting the heads out a bit will also significantly benefit the top end airflow, you just need to make sure if you go this route that your machinist knows a thing or two about 6.4 head porting as the chamber walls are inconsistent across different sets of heads and sometimes can be very thin in spots.. A ported manifold as was said earlier will greatly help. Im a fan of Elites ZMax for the airflow it creates but the price is a littlew higher. I personally own an RCD as I wasn't as knowledgeable at the time but better yet O'Dawgs Diesel is releasing his 1 piece casted 6.4 manifold any day now and honestly I can say looking at his 6.0 manifolds I'd probably go with his new 6.4 manifold over any of the others. HD pistons that are coated and delipped are a must, stock pistons crack even on stock trucks on 6.4's. You can fly cut them but that's only advisable if you have a large grind cam. New rockers are a good idea as well as the HD lifters with added oil bearing. You will need a trans with a good converter with some billet parts to hold the power, there are many good reputable builders out there including Tadd @ Elite Diesel, Morgan with Midwest Diesel, Suncoast and a few others. For a 6.4, you really cant beat an H&S Unit with MCC tuning. If you are near Chicago, Josh Davis @ RCD isn't too far away and he now has a superflow dyno I believe and I guarantee could live tune your truck for you. That would be my recommendation. My last piece of advice.....People say you don't need rods at this power level. I personally feel like it's a gamble. I've been getting away with stock rods now for about 2 years. Granted mine are cryo treated and have custom machined wrist pins and ARP rod bolt and cap bolts...and I don't have nitrous on the truck either. Also my truck does not run a single charger, it is compounded (so i really took a bigger risk) single trucks don't make the torque that compounds do so more single turbo 6.4s are common with stock rods. Mike Corsilli was making some serious power on his blue crew cab 6.4 with a big single s476 and stock rods and I believe it was making 1000+ for 2 seasons before his let go. He really liked to spray his truck too That being said, if you want to make 800HP and do it right, I STRONGLY suggest if you have the $ to get a set of Wagler or Carrilo rods. Compounds make low end torque and torque is what kills rods. If you want to have a peace of mind in doing this build for that power level and not have to worry about your bottom end ever, I strongly suggest billet rods being put in. I wish I had done it to mine now. FWIW if you were interested I'll make a you a good deal on my truck if you were interested. Turnkey 850+ HP [/QUOTE]