I have a 1978 6.354M. The drain plug is on the lower left side near the rear of the block buried in an awkward place behind the oil cooler. It has a 1/4” NPT plug. I took out the plug and replaced it with a 1/4” NPT threaded petcock to make it easier to drain the anti-freeze. I push the small tube of a hand-pump vacuum extractor into the petcock, get the vacuum going with the hand pump and open the petcock. The tube is not a perfect fit so I have to keep pumping but it goes quickly.
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