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It is rather unusual to see temperature go up after an acid flush, even though (as you say) 170 degrees is still in the very normal range. I would look at the amount of water coming out with the exhaust to be sure it's still a normal amount. You could have loosened enough crud to partially block the fitting where your cooling water enters the exhaust system or perhaps the 90 degree elbow at the rear of the manifold.
Don
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