More HP from 5.9 Magnum

Be careful with a cam in stock heads. I've seen 3 sets, that the retainer hits the valve seal at around .525 lift. I have the upgraded springs and retainers that are good for .550 lift, bit no way to run a lift like that in a stock head. Need to cut the guides down. I also did 4.56 gears, headers, and good ignition. Runs pretty good. Currently doing the nitrous instal.