Originally Posted by Andy
The H22A will be faster for the reasons stated above. The H23A may have slightly more torque, but it will probably be very hard to notice (the displacement difference is far smaller than say that of a B16A vs B18C). The H23A will be much cheaper and easier to locate however.
yeah, the difference in torque is only like 5'lbs, whereas the difference in power is up to 50hp depending on the motor. Definitely get the h22a if you can.