Did you take these measurements when it was warming? Normally the area that you are aiming at temps are closer to where #6 is, 500 deg F is normal for a warmed car.
You should check the temps, at each cylinder at close intervals as the car is warming up from cold.
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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