i dont know what rpm he idels at,but if around 1100,i think they would stay dry,its worth a try,as long as our o2 sensers aren,t the guinne pigs,lol.

What is the reason for further down the collector? Does it make a difference in the reading? Mine are at the riser base and still get moisture on them at idle.

If you look at this pics, you can see where the bungs were located on the BAJA. Ran em full time as you know for a season, with good readings

fast recommends 18 inches of pipe behind the sensor if possible,mine are about 12 in ,but they work good.

In a marine application?

Does anyone know why? Mine are at the base of the riser so I need to know if it pushes the reading more rich or lean...

i dont know for sure,but i think thats ok.the exhaust from all 4 cylinders should read good in that spot.

On a manifold setup, you have runners that pretty much dump into a common plenum, before the riser. So, you're seeing a pretty even amount of heat from all 4 cylinders.

Dan, your old setup being port injected, is much more consistant cylinder to cylinder for fuel distribution. Carb'ed stuff is more inconsistent from cylinder to cylinder. For example, #8 cylinder can be quite a bit leaner than say #2. If the sensor reads most of the heat from cyl #2, you may think your just fine, while #8 is lean. Is it enough to matter, I don't know. I know most factory cars put the 02 in the pipe after the manifold, but before the cat.

I would try to avoid welding on older stellings at all cost unless totally necessary. I've seen where welding on certain stainless, can lead to leaks in old welds nearby.

Eddie Young suggested I install the 02's in the tailpipe, downstream a bit from the collector. Im no expert, but when the pro's speak I listen lol. Maybe one of them can chime in and give some insight.

chime in//// insight, wait a min... ok much better!

I'm thinking about adding O2 bungs in my Lightning headers. I have 8" between the tubes and where the water merges into the pipes. I have a pretty big cam, 242/252 @.050" with an LSA of 112 degrees. I've had the headers off several times and the pipes are always dry inside with no signs of moisture in the upper collector area or pipes. I was thinking about installing the bung halfway down the collector at 12:00 so it sits between two pipes. I'd like to get some feedback on the practicality before I waste a bunch of money.

FWIW - Mine are right before the collector. If I idle for a few minutes before starting the test, they always come out with white residue. Moisture/Salt