I'm trying to Identify a set of pistons, supposedly they are Weisco, part number 6555M925. I'm not sure what size over they are either. Can someone confirm?

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I've got an oil leak into my coolant system that I cant figure out. I am getting oil mixing with antifreeze in my radiator. But no coolant mixing with my oil at all. (Nothing shows up in my oil pan)   I recently threw on a new cylinder head and I've got good compression across all four cylinders. I did a leak down test and I cant find any head gasket issues leaking into the coolant system at the cylinders. I had the radiator rebuilt at a shop after the old head cracked so its clean. I also

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