A few months ago I started a 25.5 touring car class with the Novak boss 25.5. It has been successfull. At first we were slower then our Usgt 21.5 class. Now we are faster. The main reason for our speed gain has been the motor analyzer I bought. It has been used by everyone & everyone had seen success with it. Most of us are running 58° of timing geared 3.7 on a 140'x75' asphalt outdoor track.
I have set up many Novak 25.5 motors & have only found one of them to be better then the rest. Very good and consistent motor from motor to motor.