You can count the bolts that are on the head. The six-bolt head fits the K-91 with a bore and stroke of 2.375 X 2.000; displacement of 8.86. The K-161 has 7 bolts on the head with a bore and stroke of 2.938 X 2.500; displacement of 16.94. The K-181 also has 7 bolts with a bore and stroke of 2.938 X 2.750; displacement of 18.64. The K-241 has 9 bolts with a bore and stroke of 3.251 X 2.875; displacement of 23.85. The K-301 has 10 bolts with a bore and stroke of 3.375 X 3.250; displacement of 29.07. The K-321 has 10 bolts with a bore and stroke of 3.500 X 3.250; displacement of 31. Let me know if you need more info as I have the manual on these Kohlers.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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