That happens a lot if the sender is in the head, near the exhaust. It will pick up some of that EGT and transmit it. That said, in the head is actually the best place since the fueling calculations create cylinder temperature by reading IAT and Coolant. By having the CTS in the head you don't have any radiant cooling effecting the reading if it's taken in the cross-over.
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-Jason
1969 Pontiac Firebird
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