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Who has had their head off recently? 200 1991

I'm trying to sort out a little mystery here. My new '91 245 (B230) had a rebuilt head just installed when I got it. I had to fix this water leak to be able to drive it and I'm wondering if something is missing here.

There's a hole in the head that goes into the water jacket. It is threaded, (1/8" NPT?) and sits just underneath the rearmost bolt on the #4 intake runner. I plugged it but is something else supposed to go in here? The heater hoses are hooked up right and both temp sensors are in the right place and functioning. Do you think the rebuilder removed a plug and forgot to install it?

Thanks,
--
Nineteen Volvos
445-544-122-1800-240-740
Four turbos






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