The 30-50 'Y' Oilpull came out in 1929 only & all 245 units were produced that year. Out of that number, 90 survived making it an amazing 36.73% survival rate! The 'Y's heavy duty, two cylinder, kerosene, engine with 7 13/16 inch bore & 9 1/2 inch stroke put out 44.5 HP on the drawbar & 63.32 HP on the belt in Nebraska Tractor Test #145 while operating at 610-635 RPM. The whole tractor weighed in at 13,025 lbs. Other specs are available ON REQUEST. For more SN info on the 20-40, CLICK HERE.