Okay, well as many of you know I plan on "massaging" my 2.7 this spring and I've been racking my brains trying to figure some things out on how to do this. Let me begin by saying Im NOT going to buy a 3.5. I pride myself on being unique, and a 2.7 thats mildly built up is pretty cool IMO. A little backstory to my decision on this. Back in the spring, I did a Special PCM swap at Dan's meet. Im the first known 2.7 to run a Special PCM. Im not over exaggerating when I say it really woke the car up. A normal 3.5 HO doesnt run away anymore, it walks/crawls and I have witnesses on here and first hand testaments from fellow members. Seeing how much that PCM did for the car I decided to go the unique route and build up my 2.7. I figure when I break her out of mothballs this spring and do my timing chain and waterpump, I might as well take the heads off and get them ported and polished. And if I take the heads off, why not have the cams reground as well? This will be done with a custom intake spacer and bored out throttle body. But I do have a few questions pertaining to this that can be hopefully answered
- The 2.7 LIM is a plastic composite. Can I use an aluminum spacer, or does it have to be plastic as well? Can I eliminate the plastic LIM altogether and integrate the spacer and LIM all in one solid piece of aluminum?
I would think that you would want to keep the LIM, as redesigning it in aluminum would be cost prohibitive. I would use phenolic in your case as the rest is plastic as well. See how much clearance you have for a spacer. Longer runners = moving the torque into the basement.
- I've heard here and there that the 3.3 exhaust manifolds are very similar to the 2.7's. Would it be possible to swap the headers in the same manner as the 1G 3.5s and 2G 3.5s?
Get a pair and test it out. Get a set of heads (will come in handy for the next step) and try the 3.3 manifolds there. If they don't work, you might be able to fabricate a spacer that might fit the application.
- What would my tolerances be for a cam regrind? I dont want to go super aggressive, but I want a little more oomph that whats at hand right now. I dont know if I should be looking at 2.7 tolerances or 3.5 tolerances due to the PCM.
Use the heads you got for test fitting the 3.3 manifolds and take the cams out, and send them to Crower. That is who can regrind them, they can also give you tips on how to get what you want out of them.
Hopefully I can get this project underway here soon and have it done in time for Carlisle this year. I'm trying to find a decent set of heads for a good price so I can jumpstart this project instead of waiting until spring. Thanks for the help!
Squilly, you know I got your back on this one, provided you don't leave your phone on the windshield again!!