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Originally Posted by ChassisWelder
That's typically an indicator of too little timing, or an excessively rich condition, causing the unburnt fuel to ignite in the headers. There is NO WAY the header should be glowing like that under ideal/properly tuned conditions in that amount of time. The EGT's would have to be through the roof.
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You mean slightly lean. I could light a smoke off my manni after a good high PSI run on my 89 supra. Running A little rich cools the piston heads and helps stops detonaton.