340 Ultrasonic Wall Measurement Sanity Check

I measured my 340 block for wall thickness using an ultrasonic thickness tester I bought off of Amazon. It a cheap Chinese unit, but seems to work ok on cast iron. I dont have any delusions that this gauge will give my super accurate results, but it will at least give me an idea on thickness and core shift.
The results seem pretty good. It picked up that the thrust and anti thrust sides of the cylinders are thicker than the sides and core shift seems reasonable but it seems to be reading...

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Author: JedIEG