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That's a hole for temp sensor, from the condition of the metal around the hole looks like nothing was ever installed. You can either install a plug or leave be. And yes I did read it is on a carbed engine. Maybe HD cast all the heads like that or a head got replaced.
Last edited by seniorsuperglideE8; Jan 31, 2020 at 01:55 PM.
That hole looks like it already has a plug in it. I have never had the valve covers off so just a wild guess, might it be where the hole was drilled for the rocker arm pivot or something similar?
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