Hey guys I have just finished replacing a colapsed lifter, ajusting all the lifters, and setting my timing to 36 deg at 3000 rpms. I had to back off on the timing as it was set up near 40 deg. total. I put my car on the dyno and it put down 417 hp at the rear wheels with a 100 shot of nitrous. The fuel curve was just right up to 6200 rpms so my jetting is OK. My question is that when I run the car for 45 seconds at 2000+ rpms the #5 & #7 header pipes start to glow orange a little bit. My engine temp is a cool 170 deg. during this event. After I bring the car back to idle the orange glow goes away.

I spoke with a fellow racer and was told that the glow was a result of being too rich. The unburnt fuel burning in the pipes. I am running a colder than normal plug as I run with a 100shot of nitrous most of the time. If I increase my initial timing, I will also increase my total timing. I want to keep the timing at 36 total. I would appreciate any ideas that you all may have as to how I can stop those two pipes from glowing.
Thanks in advance,
Daniel

Sorry for the double post, I had a glitch during the posting process.

Glowing headers are a lot more common than most people realize because they never see the engine under full load. We see it all the time on our chassis dyno and it's not cause for great alarm.

I had a problem with glowing headers at idle. Turned out my balancer had slipped and my timing was VERY retarded.

Advance your timing.