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Yes, they are 230 blocks.

The "230" blocks came both ways, thick and standard mains.I have one of the thick ones and two that are not Only some of the first castings made bewteen 07-71 and 10-71, I think, where the cold weather thick main web blocks In other words not all the early "230" castings where the better thick main web ones



I will check them tommorrow, I know a couple of them had the heavy main web.