Agree with MOnte on a gas motor the EGT means pretty much nothing other than the hole is lit. The numbers can vary way to much due to many things, Fuel type, timing etc
Some of those black headers shown have been my experience. They tend to get chalky and don't last but maybe just whose doing it. We have gone to a new deal that is basically a piston coating on the headers. So far seems to be working very well.
I'm not saying tune your engine by the EGTs... I was asking
on a good nos tune up.. what kind of temps would be expected
and EGTs would be the only place to get a temp from
