It's like you said: heater hose area. I believe I've seen this at the very back of the head in the valley holding a hose. The hex retaining plug for the valley plate, behind spark plug number 6, is threaded in the center. I have a GTE so I can't be more specific other than remembering photos I've seen or parts yard flashbacks.
Last edited by Bru; 08-16-2021 at 02:02 AM.
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