I know that I'm pretty late with this but...could anyone help with a conclusion to this thread? I've been really trying hard to research a swap like this and this is the only guy I've found that has gotten this far. I'm really starting to feel like there is some sort of conspiracy against swapping engines in the Envoy/Trailblazer platforms. Yet there are Japanese and European imports out there running American LS engines in them. If there is a continuation to this thread somewhere, can anyone post the link or point me at the source of further info in this? I appreciate the work you've done Decembersend and it's given me hope for my TB. Thanks!