Hey, I think you made teh right choice to change teh glow plugs. I have teh 7.3 style system on my 6.9 and teh wait light stays on 7-10 seconds when dead cold even here in Florida, where our morning temps when I go to work or whatnot are usually 70-80*F. It sounds like you had one bad GP when you got it and now have 2 or more dead ones. Please pay attention to what Pete said and don't pull a glow plug that gives you a lot of resistance. This could lead to disaster! I would roll the engine to TDC for each pair of pistons just in case something drops in you have a good chance to pull it out through the inj. hole with a shop vac or similar. Also you might want to ahve your injectors tested while you have them out and get the thing timed profesionally when you put it back together. For fuel economy, you should probably be getting 14-18 empty with the ZF-5 and 4.10s. I don't know how much improvement you would see with 3.55s with the O/D added, or how much of a power loss. As to the Banks turbo, I would say if teh motor's in good shape its probably not too late to turbo, how's your power and oil consumption/ blowby? You would also want to take teh valve covers off and check the valves to make sure they don't have excessive play. Dropped exhaust valves are the #2 cause of premature death ona 7,3(right behind cavitation), so ya I'd look at teh real carfully before turbocahrging, but other than that I don't see what you'll hurt as long as you keep your boost to <13psi or so and EGTs <1150 or so. Seek other knowledge for exactly how to check the valves if you aren't sure either because I can't really tell you how to do it, and if you do something wrong you could dropa valve manuially and create a problem that wasn't there originally. Good luck,
J.D.
J.D.
