Generation IV External Engine - Headers running too hot , please help

Hi , My friend installed his new LS3 engine and put into his 2007 Lumina SS , Well after installing we start up the motor and noticed the both sides headers are running too hot and the color of the headers changed to orange , After that we replaced the seals for injectors and intake and still running same , Car isn't missfiring and the idle is good .

I told my friend maybe you have bad knock sensors or timimg is retarded and has bad spark so what you guys think ?

Thanks in advance

Glowing headers are usually a sign that the motor is too lean was this motor tuned??

Glowing headers are usually a sign that the motor is too lean was this motor tuned??

No yet he didn't tuned .

I wouldnt run the car too much or drive it till he gets it tuned you may damage something.

Could be too lean or too retarded timing. It might still be burning fuel in the exhaust.

i just ran into this problem on an older 350, what type of manifolds are on it? that was the problem with ours, cheap headers=800 degree exhaust gas, swapped headers and went to 350 degrees, just something to check, i replaced manifold and gaskets and carb. before i figured it out.

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Huh???

wheres the timing set at?

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Huh???
if your responding to my post....... sounds crazy but that was the problem.

I wouldnt run the car too much or drive it till he gets it tuned you may damage something.

+1 here

I'd go with too lean as well, get that thing tuned

Did you put this LS3 engine with its own computer in the Lumina? Or did you just pop it in there with the stock Lumina computer?