I am considering a major freshen up for my 93 NA 7.3. I would like to go the full route and add a 2nd hand used turbo on it (checking on fleabay). I know the compression is the same on factory motors (turbo and N/A), but wondered if the turbo rods were worth the upgrade (with pistons). I get the impression that since the flywheel and harmonic balancers are different on IDI turbos, that the rotating assemblies may be externally balanced and that adding heavier rods will mean rebalancing the crank/rods/pistons. What is the boost and HP/torque limit on a factory N/A rod with no external problems (keeping water and shrapnel out of the intake) and below 3200rpm? I saw some pics on the DPS site of stock N/A pistons that had been run with 18-19lbs of boost for 68k miles and they looked pretty good (except for the pockmarks from a GP tip in one of the chambers). Does anyone know if they make cometic head gaskets for 7.3 IDIs? if so, who sells them? thanks, Dan