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So I bought the Bosch LSU 4.9 wideband oxygen sensor and ALM-board.

Specs for the LSU 4.9 says max operating temperature is 930 °C (1700°F).

I recall seeing 1950F EGT temps on my 13B with EGT probes 8" from the
side of the engine.

On the RV-4 Renesis,  before buying the wideband sensor, I welded the
bung 12" from the closest port. (Stock manifold cut and 180° turn at
exhaust port nearest flywheel, 2.5" pipe.)

I expect the Renesis to have slightly lower EGT temps, but am worrying
about damaging the O2 sensor.

Charlie suggests mounting the sensor on a longer bung, moving the sensor
out of the direct gas stream, but I feel that may reduce the accuracy of it.

My plan was to use the cheap narrowband O2 sensor initially and find the
engine settings giving highest EGTs, then temporarily mount an EGT probe
in the O2 bung hole, run the engine at those settings and see if EGT
there was safe for the wideband sensor.

But maybe I'm worrying about nothing.

Do any of you have data on how rapidly the temps drop as a function of
distance from exhaust port?

Finn