I would go just what you need to clean it up if it's 20 over already and worn I would go 30. As for the k301 haven't heard of a 40 over piston, google it or go to stens website and see. I would have someone look and see if your k301 is a thick block or not.
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Brian
April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake!
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