so im usin a set of exhaust manifolds left over from my old 02 z28 on my 5.3l swap and havin some clearance issues with the o2 sensor on the drivers side. the position of it would make it go into the frame. did you guys plug it and relocate them or what? i can get a pic if you wanna see what im talkin about.

not that my exhaust is done yet, but i found the same thing when i first installed the manifolds. plug the hole and weld in a bung further down the y-pipe

yeah thats what i was thinkin about doin.

I plugged the bungs and set up the sensors on the ypipe. You will prob need the extensions too. I'll post some pics later this week. It was a pain in the dick to set it up. O2 sensors kept hitting the pan and shift lever. The lt headers i have are really made for a manual setup. Pita lol

Ill try to get you pics, but I put mine right after the manifolds facing the front of the car. Thats where they had the most space and im not worried about them hitting anything.

I havent put my bungs in yet, but I bought a set of bungs and plugs from Summit for cheap and plan on relocating them onto my y-pipe.

that's where mine are. both are just below the collector so there is no need for extensions.

yep, relocat... I put mine where they are real easy to get to under the car. just remember to put them midway up at least in the pipe, mosture doesn't run over the sensors...

is this common that everyone relocates the o2.I havent tried sitting the motor in with the 02 inplace yet.Looks like I better plug the driver side manifold while the motor is still out and buy bungs and extend some wires.

I would like to know too.

Summit or jegs sells 02bung plugs

ebay sells them cheaper. ive bought alot of them before.

so is it a common fact that both front o2 sensors have to be relocated when using stock fbody manifolds? I thought only the passenger side needed the o2 bung welded in?

When i built my wiring harness i just used the leads from the rear 02's for them.

HO2 location, halfway down the 45* bend from the collector flange. For best results the HO2s need to be approx the same distance from the cyl heads

Drivers manifold came with a broken off HO2 already installed. I left it in as a free plug for the hole

Cheap HO2 bungs, go to any local parts store and get a pair of spark plug anti-foulers for large plugs (lawnmowers). Cut off the tip and they work like a charm

This is what i did. Sense i had to take my car to the ref after the swap and the factory cats are really close to the manifold. I plugged the factory O2 bung and welded another bung right next to it. its a tight fit but it works like a charm. Been running like this for 5 years without any problem

wow thats tight lol.surprised it doesnt brake when the motor is revved.what did you do on the passenger side location?

the motor doesnt really move when you rev it. I think for the passenger side, i just used the same factory o2 bung.

iirc the pass. o2 is in the y pipe and not on the manifold. a bung has to be welded in just past the collector