Well, after just finishing replacing LIM gaskets in my na 01 Impala, I realized how easy it was and how much better the engine would look with an M90 sitting on topSo...I've picked up almost all the parts for the swap. I will use this thread to consolidate my questions and hope you guys will be able to help.
I found a 99 grand Prix as a donor. What I wasn't able to pick off it I have found on order. M90 will hopefully be bought this weekend and rebuilt soon. The heads are at the machine shop and I'm waiting to hear how they check out.
I'm installing a fwi and speed daddy headers. I will mildly port the heads and intake myself. Basically just clean up casting marks and smooth things out. With these mods my questions are:
1. What size pulley should I start with? I will be getting it dyno tuned. Can I safely start with a 3.6-.5? I've seen members with same mods running a 3.4 but I think they had an l67 motor. With the higher compression of the l36 should I leave stock pulley on? I want to make the most of my money spent at tuner so I want to buy the smallest/best pulley for my current setup.
2. Talking to the tuner he highly suggested that I plumb in my IAT into the lower intake manifold. He seems to be a reputable GM tuner, and I don't want to doubt his strategy, I just haven't seen anyone do this. With my limited knowledge of tuning it kinda makes sense tuning the timing based upon the post m90 air temps, but I question things like heat soak and the iat fowling due to the dirty environment it will be in (the intakes I've seen are always full of carbon and oil). Anyone help me understand his logic?
Thanks for now. I'll keep you updated as I go.
