Depends on what you are doing when you see the glow. If you're breaking in a cam and running it at 2500 rpm for 20 minutes I wouldn't be suprised, but if you're just messing around tuning and crap at idle for a while then I'd say you have a problem, too lean, too much timing advance. Normally hedders should never get hot enough to glow, even a little bit. I'd be pulling some plugs and taking a look at them to determain if you're running lean. You start mixing lean with advanced timing and you are looking at burning holes in pistons! and it will happen fast, not to mention head/valve problems that can result. Always better to be a bit rich than a bit lean.

^ x2 I can't remember if my Hooker headers started to change colors or not when I was running it hard. That was back in 2001 I now have the cast iron ramhorn manifolds. They seem to work quite well in my jeep and if those start glowing......

Sorry Felsengleiskette but I saw this pic a few weeks ago and your last post reminded me of it. That WAS a turbo.

^wow thats some crazy heat!!!!! my situation is nothing like that! lol. im gonna check some stuff out, but i actually think where im at is normal hedder temps. (i've nvr had hedders before) im used to my old setup in cast. but i will also check into cast hedders for this engine as well. im going to strap a thermo-couple onto a tube and get a temp. just for giggles.

Cool. Keep us up to date.