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Skirt tabs on cast pistons are very easily cracked/broken just handling the pistons while on the rods-the flip side to side against shank of rod will very easily crack and/or break off the amount of...

I think maybe you also have a problem with your compression guage-maybe filled with the coolant?????????There isn't any way that those pistons on stock heads/block would have that much compression

So are the heads modified in any way????? milled, ported? And did you use any sealer on the head bolts?/ If the heads have been ported( and those port walls look thinner than normal and close to...

Looks to me like you didn't drain the block before removing the head so the fact that there is antifreeze in the cylinder is false info looking for a cause