if i were to pull the ls6 heads off of my car, have them ported and polished(no milling or decking) would i be able to run the car for a little while without having a retune?

I just figure that since im not changing the compression ratio that it should be ok, but it would it change the air/fuel ratio?

i just live about 6 hours away from my tuner and while my tranny gets rebuilt i figure it would be the perfect time to have the heads ported...but i wont have an opportunity to head to the tuner for about 2-4 weeks...

 

I don't think you would have a problem, since i dove my car about 220 miles to get to my tuner, and i had the heads ported w/.04 cometic, G5x3 cam installed and LG headers at the same time and the car ran fine but bucked at low rpms, under 1500. I think the bucking was due to the cam not the heads.

 

This is my daily driven car... so ill prolly have to put more that 500 miles on it...

 

Porting the heads won't change the tune much more than a set of LT headers would. You'll be fine. Probably a bit lean.

Re'

 

As stated above the ECU should be able to compensate, it's when you add a cam and change valve events that you need to worry.