If you simply remove the Head, do whatever you are going to do, you can replace it without any problems. You will of course need to tighten it down a couple of times and re-set the Valve clearances at the same time. You should be careful when lifting the Head that you remove the Push-rods or they can drop down and are a pain to get out. Don't be shy about adding the vinegar, its cheap enough and you can't really overdo it. If as you think the holes between the Block and the Head are blocked or restricted, then is the water in your area very hard as that will cause it. You should use these engines with a rust inhibitor all the year round to prevent this, anti-freeze will also prevent it. I will send you some info about the repair if you need it..John(UK)...email@example.com
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