andy r, We use a product called Calci-Sol, only place we could find it is at a plumbing shop. It is a acid so it does have to be neutralized with baking soda water after you flush it out of the core. We always took the core out of the vehicle and poured into the core while it is in a tub,for safety we also use rubber gloves on the hands and goggles for the eyes.We use alot of plastic totes so we can swish it around with a lid on it. This product is marvelous for desolving rust/lime/calcified deposits. Just make sure you keep it away from children and pets,and don't stand over it while it is being used the smell will harm the lungs.It truly works.They use it in boiler systems for removing such problems. The place her that handles it is W.A. Roosevelt part # for it is 4134-24. The last cost for a quart was $6.34. Two quarts should do that core with extra left over. We also use it to clean rust off of bolt,nuts washers,anything that we can fit in a tote that has rust or corrosion.Just don't use it on Aluminum or Magnesium type metals.It eats it up. Hope it helps. Regards, LOU
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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