It's hard to guess at something like this with the info provided but blowby is caused by air getting past a psiton. Which means that A. the rings on just those 2 pistons suddenly went bad or B. something cause damage to the pistons. You need to do a compression test and check your numbers against what the book says. And yes injectors can go bad and damage an engine.
Best guess would be that crud in the water jacket prevented flow around the cylinders in question and over heated those two cylinders.
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Today's Featured Article - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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