Early years were 3.125 bore by 4 inch stoke for 123 cubic inches. Later years were 3.250 bore by 4 inch stroke for 133 cubic inches. Rated for 1-16 plow or 2-12 plow.
 
Tag on engine says 3 1/4 x 4 Had it running today. It has set a long time. Not over 30 lbs compression on 3rd cylinder. Could valve be stuck?
 

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