[akdg87]

fuel economy could be good if you keep your foot out of it, but that is really hard to do once you get used to listening to the turbine wheel spooling up.

I have a turbo 5.3 (70 MM on 3 performance turbo), stock lm7 short block, ls6 cam, stiffer valve springs, push-rods, rocker arms, head studs and 6.0 liter heads.

I would say plan on spending at least $3K to turbocharge a LS that is running and driving already in your vehicle. This includes: fuel system(injectors,regulator and pump), turbocharger, cold side piping (pipes, BOV, intercooler), hotside piping (KB racing makes a hotside that will work in the 67-72 GM's), wastegate, gauges (boost, fuel and AFR), PCV system and most importantly a good tuner to dial it in.