'blazin-
i dont mean to come down too hard, but i dont think you have any idea what is involved with boring and/or stroking. you stated that you dont want it down too long because its a daily driver, but rebuilding the engine is likely to take it down for some time.
eh... turboing anything but a very common engine in a very common car is usually not a bolt-on deal. i am certain you could find a shop that would custom-build a turbo setup for your trailblazer, but that is also going to be a bit lengthy not to mention pricey.
my suggestion to satisfy both your power requirements as well as down-time and reliability issues would be to have somebody develop a bracket system to get a centrifugal supercharger setup for about the afore-recommended 8psi. im no pro at this, but thats my plan so far.
also, check out the chip jet has for it at
http://www.jetchip.com/products.asp?pid=18614&make=22&model=489#489 looks like they have a dyno sheet for an 03 with the stage 1:
http://www.jetchip.com/pdf/dyno/chevrolet/2003Envoy4.2L.pdf it probably doesnt take boost into account and i dont know if jet could custom-build you one or not. check into it
anybody that knows anything care to add?
