I have an 89 camaro rs doing an ls1 t56 swap, cant seem to find the answer to my problem anywhere, tired of scratching my head. mounted the stock k member, which i have already knotched, to the engine and i am having clearance issues with the drivers side manifold. the factory o2 sensor will not clear the k member. its not by much but is obviously an issue. I havent read anything about people modifying the frame on that side to clear the sensor.

 

I don't have stock manifold's, but I remember reading that you have to relocate the O2 sensor bung somewhere. Do a search for driver side O2 sensor and see what pops up.

 

On the forum ncdave has notched or put a hole in the frame to accommodate that sensor.

On this thread - "91 Z28 California smog legal LS-1/T-56 swap"

 

Check my build thread, post #27 I show when I hit this snag.
https://www.thirdgen.org/forums/ltx-...-t56-swap.html

So, I plugged that hole, (welded the head of a bolt in the hole), and when I did my exhaust, I mounted the O2 sensor in the exhaust just after the manifold, positioned the sensor upright in a way that was easy to get to... Which paid off as I had to swap that sensor out, took me 10 minutes, I didn't have to jack the car up to get to it either... I actually did it without seeing it, since I knew exactly where it was, all I had to do was reach for it! A bit of forethought with some stuff really pays off.