3 x 5, the pulley is 20 inches in diameter and it stands 35 inches tall. This is the nice small size that makes a good demonstration piece with a gas engine. I didn’t see any cracks in the pump casting, only one little crack on the gear guard- see photo. I didn’t test it with water. It had a lot of acorns in it when I got it. But it turns nice and smooth. I do not have the bolts to hold the air dome on. The item “FAIRBANKS MORSE PISTON BULLDOZER PUMP HIT AND MISS ENGINE” is in sale since Sunday, July 17, 2016. This item is in the category “Business & Industrial\Light Equipment & Tools\Stationary Engines\Engines”. The seller is “rosienh” and is located in Rochelle Park, New Jersey. This item can’t be shipped, the buyer must pick up the item.