Hey, I have a older 48 " Exmark Viking gear posi drive belt walkbehind with the 14 horsepower kawasaki. I want to buy a new 17 horsepower Kawasaki for this mower. My question is are the block sizes the same? The current 14 kawi just clears the shaft that drives the wheel pulleys, the smaller ones that spin the belts to turn the wheels. The added ponies would be nice if the room is there.