Quote:
Originally Posted by Shoebox
That looks real good. Are those bungs on the head pipes for A/F sensors?
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No, those are for EGTs (which is why they are as close to the port as possible). I have O2 sensor bungs in the pipes that bolt to these headers (with gaskets). It is important that there are no oxygen leaks before the O2 bungs - which is yet another reason to add flanges to the "Belond Style" headers that everybody seems to make. Also, you want the O2 bungs at least about 2 feet back from the ports.
Having both O2's and EGTs gives me what I need to tune the carbs. I use the O2's the most as I'm not running these on a boosted engine (where EGTs become all the more important).