I agree 100% on cleaning the threads just as you described, that's exactly how I do it. You'll never get an accurate torque reading with rusty/dirty/rough threads.
In fact tractor vet - you may remember the reason I have this particular head off was due to a blown gasket - on an engine that was recently rebuilt by the previous owner. (new to me farmall 560)
What I cleared out all of those bolt holes in the block answered the question for me of why this newly installed gasket probably blew. I don't think they've been cleaned in 60 years. Thick,dry, black gritty nastiness. I had to chase them and flush them several times.
Same with what I wire brushed off the bolt threads. Nasty.
had the head been on there for 20 years that'd be one thing, but as I said, this thing was just rebuilt. Somebody clearly rushed the job.
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