IH has specs for blowby. I think it is 4.5 inches of water on these engines when equipped with the pressure balanced piston, wide gap second ring, of course with the correct orfice on measuring tool. I would say that 6 inches is high regardless of which ring or breather system you have. Blowby is of course only one of the reasons to consider overhaul, hard starting, oil consumption etc being others. That being said, the wide gap second ring did a good job of drying up the oil consumption on these engines but it did lead to some other unintended problem. When moving the crankcase breather to the valve cover some of the oil mist that was carried out over the camshaft was lost and there fore more cam failures started to show up so they had to come up with solutions for that, and the top ring life is greatly reduced so another problem to overcome.
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