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Re: What to do with this 350?
I've had 3 astro vans with 4.3's. The first two, an 89 and a 90 leaked coolant into the left rear cylinder from cracked heads I believe. The 90 I owned since nearly new and took it to almost 300k or 400k kms using bars leak. At one time the fan came off and went through the rad. I was surprised to find the rad not clogged at all. For a tiny leak I wouldn't hesitate to use that stuff.
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