I once had a cooling problem on a setup I was flow testing on my test stand engine and the problem turned out to be a blob of casting sand that had never come out of the water neck. The problem drove me crazy until I took the water neck off and tried to look through it and saw the blockage. Of course digging and banging the sand blockage out solved that problem pronto. You might look inside your water neck, intake manifold, and every other water passage and see of you have something like that going on.
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