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My TTI headers got toasted....Don't know whether to recommend just making it richer to start with, but the idle mixture setting from the stock heads was enough lean with the new Indy heads at idle to make the headers glow in short order, like real fast! So my headers are cooked.
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If your headers get cherry red hot, then the mixture or timing is off. Set the timing as soon as its started. Use a known good carb. If you have made performace changes richen up the primaries 1 or 2 sizes for safety.
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A flat tappet 20 minute run-in DOES NOT have to be all in one shot.
As long as it fires up instantly without any excessive cranking....5 minutes at a time, or 10 minutes at a time works just fine.
Let it cool off between runs, and then do another run until your total equals at least 20 minutes.
The idea is to run in the cam and lifters, establish lifter rotation and a wear pattern. The oil and coolant temp, as long as within safe limits, can be on the cold side during the process and it will not do any harm whatsoever. There is no need to melt it down trying to do it all in one shot.
