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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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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