Thanks mem, also I'm needing to know if I can bolt this engine to the 7R400 transmission without much hassle. I have contacted Painless Wiring to see if they have a harness that will let us run this engine trans combo. Also does the stock motor mounts work with the LS based motors or will I have to change those out too? If we go this route I'm sure I will buy new mounts because the ones that are on the Blazer are probably OEM and very old. I just need to know if I need to be looking at something different than what I have.